How to calculate the exact date of conception. Calculation of the date of conception - birth calculator

How to calculate due date

Stanford University adheres to the following calculation formula:

Set the first day of your last period.
Count back three calendar months
Add a year and seven days to this date.

For example, your first day of your last period was September 9, 2019. We count back three months and get June 9, 2019. We add a year and seven days, we get June 16, 2019 traffic rules - the expected date of birth.

The site team understands how important it is for expectant mothers to be on the alert, therefore it offers a new service - an interactive pregnancy calculator, designed specifically for you.

With the help of our calculator you will be able to accurately calculate the date of delivery and all the main points of your pregnancy. The calculation will take only a few seconds, the page will refresh and you will receive your weekly pregnancy calendar. Now you will know exactly when the baby will be able to move his fingers, respond to your touch, hear your voice.

If it seems to you that you became pregnant earlier or later than your menstruation, then after a planned ultrasound scan you will be able to calculate the gestational age again, based on a number of medical indicators. Thanks to our service, you will know the answers to many questions regarding your gestational age and expected date of birth.

Benefits of using
pregnancy calculator:

Every woman with the onset of pregnancy has many questions. When will the belly start to grow? When will the baby start moving? When do I need to register at the antenatal clinic and when can I go on maternity leave? When can we expect the baby to be born? All these questions can be answered on our website. We have described for weeks all the changes in the body of the mother and child, indicated all significant events;

Using the pregnancy calculator, you can find out the exact dates of each trimester, significant dates (conception, childbirth, prenatal leave);

The doctor at the reception will definitely ask about changes in the woman's condition. With the help of a calculator it is very convenient to look at what to look for, at what time certain symptoms should appear;

An obstetrician-gynecologist will definitely draw up an examination plan, tell you which week you need to take certain tests, do an ultrasound scan and other instrumental studies. An electronic pregnancy calendar is a convenient reminder of exactly when and why you need to go to a consultation. We have tried to explain why each analysis is performed and how to evaluate its results.

The online pregnancy calculator is a handy service that helps a woman to have a clear idea of the course of pregnancy and the sequence of events.

Approximate calculation for the average cycle duration and the onset of ovulation - plus 14 days to the beginning of the last menstruation.
Full 40 weeks.

Pregnancy is one of the most exciting and at the same time crucial periods in the life of every woman, and therefore it is not at all surprising that each of us wants to know the date of birth as soon as possible. However, this issue often causes numerous disagreements and disputes. Expectant mothers “torture” doctors with their questions, because they want to prepare for an important event, but they only shrug, because they are not able to accurately determine the date of the birth of the long-awaited baby.
In order to Calculate the date of birth, click the "find the date of birth" button.

Today: 02.03.2019
Date of the first day of the last menstruation:
Conception most likely happened (+-2 days):

Estimated due date:
Left before birth:

The calculation of the expected date of delivery (ED) is carried out in several ways, each of which is indicative. That is, if, according to estimates, the baby should be born on January 1, then it is not a fact that this will happen with absolute accuracy on that day. Very often there are deviations from the expected date in one direction or another. And childbirth can begin either 2 weeks earlier or later. I bring to your attention a fairly simple, but very effective way to find out the probable due date of a child, which has been successfully used by many doctors in clinics for quite a long time.

Calculation on the last day of menstruation

So to be on your own calculate gestational age and on it to determine the expected day of birth, it is necessary to remember the date of the beginning of the last menstruation. It is on its basis that all calculations are made. From this date, you must subtract 3 months and add another 7 days to the result. The resulting number will be the estimated date of birth of your long-awaited baby.
For example, the date of the last menstruation is April 22. So, from this date you need to subtract 3 months. Subtract and receive - January 22. We add another 7 days to this figure and get January 29 - this day will be the expected date of birth.
It is worth noting that this method of calculation is best suited for women with a regular menstrual cycle that lasts 28 days.

4 Alternative Ways to Calculate Due Date

1. You can find out the due date, with a fairly high accuracy, by visiting the gynecologist's office. The doctor will not prescribe any tests for this, he will simply measure the size of the uterus, which will increase in size in accordance with the age of the fetus. However, this method of calculating the date of birth of the baby is effective only in the first trimester of pregnancy. In the later lines (in the 2nd and 3rd trimester), in each woman, an increase in the size of the uterus occurs with different intensity, depending on the individual characteristics of the organism.
2. You can calculate the date of birth by ovulation, which is the most favorable period in which conception is most likely to occur. On such days, a woman usually experiences an increased sexual desire. In addition, her secretions (cervical fluid) become more sticky and thick, basal body temperature rises by a few tenths of a degree, the cervix rises, and the mammary glands thicken and become painful.

So, in order to find out when your baby will be born, according to ovulation, you need to add 280 days to this day (pregnancy duration). The resulting term will be the date of birth. If the period in which ovulation occurred is unknown, then calculate the middle of the last menstrual cycle, and then add the rest to it.
In the same way, you can perform calculations on the date of conception. However, you should be aware that this period does not always coincide with the day on which sexual intercourse occurred. Fertilization of the egg, as a rule, occurs only on the third day.

3. Hardware calculation using ultrasonic waves can also be attributed to the most effective methods that allow you to determine the term of delivery with an accuracy of 1-3 days. The most correct calculations will be if ultrasound is done during the period of 11-14 weeks of pregnancy.
4. To declassify the secret of the date of birth of your child will help his first stirring, which usually occurs on the 20th week (in nulliparous) and on the 18th - in the second and subsequent pregnancies. In ancient times, when there was no ultrasound, this method of calculating the due date was almost the only one.

As soon as the expectant mother feels the first tangible tremors of her baby in her stomach, then 20 weeks should be counted from that moment. The resulting date will be the probable day of the birth of the child. If the birth is not the first, the movements are usually felt earlier - at the 18th week, so you will have to add not 20, but 22 weeks to this period.

The effectiveness of hardware methods in calculating the term of labor

A study of the fetus in the third trimester on an ultrasound machine allows you to determine the date of pregnancy with high accuracy, and hence the expected date of birth. The fact is that only with the help of ultrasound diagnostics, the doctor can observe the condition of the placenta, the position of the baby's head in relation to the entrance to the small pelvis, the level of opening of the cervix, signs of fetal maturity, as well as many other important factors. All these parameters are decisive in determining the readiness of the future baby and his mother for childbirth.

Deviation from the deadline - is it the norm?

As mentioned above, all calculations of the estimated date of birth are nothing more than an approximate guideline, which should not be heavily relied upon. According to statistics, only 17% of women give birth on the appointed day, while the remaining 83% - either earlier or later. Thus, we can conclude that no specialist, no matter how smart and qualified he may be, is able to predict with high accuracy the date of the onset of labor activity.
Normally, childbirth can occur between 38 and 42 weeks. pregnancy. The birth of a child will not be premature or belated, but normal and physiological. Sometimes, for certain reasons, labor can begin prematurely. This happens due to deviations in the development of the fetus, stressful situations, various pathological processes occurring in the mother's body, hereditary factors, etc.
Often there is a re-carrying of pregnancy due to the fact that in the first trimester there were any complications. In addition, maternal heredity should be taken into account. If your mother and grandmother gave birth much later than the due date, then most likely the same thing awaits you. Therefore, it is very important to realize that the calculation of the term of childbirth is a very complex, conditional and individual issue for each expectant mother.

How do the features of the menstrual cycle affect the date of birth?

The length of a woman's menstrual cycle also affects the duration of childbirth. For example, if it exceeds the standard twenty-eight days, then most likely the pregnancy will last more than forty weeks, and vice versa. However, in this case, the deviation in one direction or another usually does not exceed 5 days. It is worth noting that errors are often made in such calculations, since very often ordinary bleeding is taken for menstruation, which opened after the fertilization of the egg.

Menstruation is delayed, and two cherished stripes appear more and more clearly in the tests? It’s too early to go to the gynecologist, but do you really want to know when the baby will be born, which seems to have already settled in your tummy? In this case, use the help of our service to calculate the date of birth.

Calculate due date online

There are several methods for calculating the expected date of birth. All of them are based on the fact that a normal pregnancy lasts an average of about forty weeks, counting from the start of the last menstrual bleeding. The expected date of birth will fall on the day after 280 days or 40 weeks after the last period began.

Calculating the due date on our service is very easy, convenient and fast - it only takes a few minutes or even seconds. To do this, you need to fill in the calculator windows with numbers corresponding to the date of the first day of your last period in the following format: day, month, year.

In just a moment, the calculator will calculate - and display the result on the monitor.

This service works on the principle of calculating the duration of pregnancy, which in most cases lasts for 40 obstetric weeks or 280 calendar days. The date of birth can be calculated independently if you add the required number of days / weeks to the day when your last period began. But with this handy calculator, calculations are made easier, faster and without errors. However, you must understand that this is only an approximate, approximate date when you are expected to give birth. The duration of pregnancy is influenced by a large number of factors, so it can last for different women for an unequal period of time.

Calculate due date by date of conception

If you reliably know the day when fertilization occurred, then the calculation of the date of birth by the date of conception will be even more reliable. To find out when the baby will be born, it is necessary to add 280 days to the day on which the coveted sexual intercourse took place.

It should be understood that the date of sexual intercourse (even if you are almost one hundred percent sure of its authenticity, and even if you had only a single instance of sexual intimacy this month) is not always the date of conception of a child. The thing is that ovulation (the release of an egg ready for fertilization) can occur in a day or two or even more after sex, but spermatozoa that have entered the vagina earlier can wait for this moment to merge with the egg and form a new life. Therefore, the calculations may turn out to be erroneous in a few days. But still, the date of conception can be determined approximately.

You can also calculate the expected date of birth by the day of ovulation. If you keep an appropriate schedule, then the calculations will be quite accurate. But you can calculate that very day approximately, even without knowing the exact date of ovulation. It is believed that the egg matures approximately in the middle of the cycle. With a 28-day menstrual cycle, this moment occurs on the 12-15th day. By adding 280 days to the day of the estimated ovulation, you can calculate the date of birth.

Well, having received the result, start pleasant chores and do not forget to visit the antenatal clinic on time, where you will be observed for the next nine months.

The pregnancy may be planned. Then, most likely, future parents will know exactly when the conception occurred. But sometimes pregnancy is unplanned. And future mom and dad want to know the exact date of conception in order to calculate the date of birth. How to do it?

Determine the exact day of conception

The exact date when conception occurred is almost impossible to determine. Doctors, in order to predict the date of birth, start counting the gestational age from the first day of the last menstruation.
If a woman has a regular menstrual cycle, the date of conception can almost certainly be considered first day of delay menses.
By using ultrasound examination (ultrasound) almost accurately determine the date when conception occurred. Namely, based on the date of your last menstruation and the results of the ultrasound, the obstetrician makes a forecast for the upcoming birth. With the help of an ultrasound machine, pregnancy can be seen already five to six weeks after menstruation.

If you have a regular menstrual cycle, chances are you conceived between 11 and 21 days after the first day of your last period.
Absolutely accurately find out the date of conception it is possible only in one case - if the conception occurred artificially, for example, by IVF or other methods.
It is quite difficult to determine the date of conception if the unborn child develops more slowly than it should be. Or vice versa, if it is large and rapidly developing.
You can try to calculate the estimated date of conception yourself. To do this, mark the date of the expected birth, count from this period a week ago, then add three months, then add another two weeks. The number that you get is the date of conception of your future baby. However, do not trust this method too much. Its error is up to two weeks.
More often conception of a child occurs on the day of ovulation. If your menstrual cycle is regular, you can calculate your ovulation day (the day that is in the middle of your menstrual cycle). It is most likely that the conception occurred on this day.
If you want to calculate estimated due date, you can try to do that. To do this, from the day when your last period began, subtract three months, then add ten days to this.

Don't try to calculate your conception date by remembering when you had sex with your man. From the time the sperm entered the female body, until the moment of conception, it takes from three to five days. All this time, spermatozoa "rush" to the uterus.
You can know exactly the date of conception of your child, but it is unlikely that you will be able to predict the date of birth. The thing is that normal delivery can occur from the thirty-sixth to the fortieth week. But it may also happen that the child is born earlier or a little later.

How often does a woman, upon learning that she is pregnant, try to determine the date of conception? Almost always, when sexual life is regular, and the birth of a child was not planned in advance. It is necessary to know the date and month when fertilization occurred, if only in order to determine the exact date of birth. Today, knowing some of the individual characteristics of your body, you can easily determine the date of conception online using a calculator. In 95% of 100, the calculator will accurately indicate the day it happened.

Of course, if you planned conception in advance, prepared for this day, visited a family planning center, signed up for consultations and kept diaries and calendars of menstruation and days of fertilization, then you can certainly indicate this day with accuracy. And if not? Most often, at a doctor's appointment, girls who did not expect pregnancy are confused about the dates and cannot concentrate, indicating the date when the sexual intercourse took place. It is all the more difficult to calculate the exact date of birth of the baby if you cannot remember with an accuracy of one or two days when fertilization occurred.

Proven ways to determine the date of conception

At the appointment with the gynecologist who confirmed that the pregnancy has come, you can often hear questions related to the last menstruation. The doctor will definitely ask what date the last menstruation took place, when it started and how long your menstrual cycle usually lasts. Sometimes doctors use the delay in menstruation to determine the date of conception, but the main one is still their first day. To do this, all expectant mothers are recommended to keep it, carefully and regularly writing in it the date of the beginning and end of menstruation.

The gestational age is calculated in several ways:

On examination by a gynecologist. The date will be determined very conditionally, since in the early stages one cannot do without additional examinations and knowledge of your individual data and doctor's calculations;
Most likely, you will get an ultrasound, where the exact day of conception of the baby and the estimated gestational age will be determined. This method is scientifically substantiated and the most reliable. However, an ultrasound will show that you are pregnant only at 5-7 weeks, not earlier. And the exact date of birth will be set between 9 and 16 weeks. In addition, ultrasound can be mistaken if the development of the child occurs outside the box - the fetus is too small or large;
Date of conception according to the last menstrual period. A very common way to determine if your cycle does not “float”, and your period starts exactly on certain days. If the interval between periods shifts each time in one direction or another by at least one day, then with such calculations it will be difficult to find out the exact date of birth.

Both methods are widely used by doctors to determine the day of conception and set the gestational age. When calculating, it is important to take into account the individual characteristics of the mother's body, and possible deviations in the development of the fetus during gestation. A child may be born before the due date, or it may “sit out” in the womb and be postponed.

Determination of the date of conception by the menstrual cycle

How to find out the date of conception by the menstrual cycle, if it is stable? Fertilization of a woman's germ cell occurs in the middle of the menstrual cycle, therefore, if a girl's menstruation passes with a cycle of 26 days, then 13 days must be counted from the date of their start. When calculating, be sure to take into account the fact that the egg can only be fertilized during the day, but the life of the sperm in your body averages from one to three days. Even if you remember the day you had sexual intercourse, it may not always coincide with the day of conception.

For more accurate calculations, if you keep a monthly calendar, you can use the online calculator. By entering only two numbers into the required cells - the average cycle time and the first calendar day of the last menstruation, we will quickly get not only the date of conception, but also the estimated number when the baby can be born.

But what if the cycle shifts from time to time by 1-2 days? The date of conception according to the calculator is also suitable in cases where the cycle fluctuates. It is the average number of days between periods that you can easily determine by making simple calculations on your individual calendar that is recommended to be written in the cell.

By specifying the date of conception, you can determine the gestational age and the expected birthday of the baby. It is not entirely correct when the expectant mother immediately adds 9 calendar months to the day of conception. Carrying a child in the womb takes 40 weeks, or 10 lunar months, which is equal to 280 days. This common mistake may not play a very good role in the future, when instead of going to the maternity hospital on the right day, you leave the city for a summer cottage, significantly increasing the distance that will need to be covered in the event of contractions.

An online calculator will help you accurately calculate the date of conception only if you definitely know when your last period was. Usually, gynecologists very quickly calculate the approximate date of birth of the child, and then confirm or correct it on an ultrasound. As a starting point, doctors choose the starting day of the last menstruation. 280 days are added to this date, and then the approximate period left for ovulation is subtracted - 14 days.

Doctors do these calculations in their heads, and very quickly, since they have to deal with them almost every day. For a woman who has found out about pregnancy and quickly wants to determine the day of conception and birth of a baby, such calculations and formulas may seem too confusing. In addition, the first news of pregnancy, if it was not planned in advance, most often makes expectant parents nervous, and in this state it is very difficult to make accurate calculations.

Take advantage of the offer and determine the date of conception using the calculator. This will help you calculate your baby's due date, prepare for that day, and be mindful of carrying your baby through the nine months.

Dr. Komarovsky: preparation for childbirth

If your pregnancy is confirmed, then I wholeheartedly congratulate you on this bright event. Carrying a baby is a wonderful, unforgettable and special period in a woman's life. And this boundless happiness is not given to everyone - always remember this!

Nothing compares to carrying and giving birth to a baby. And no life problems, difficulties and troubles can exceed the significance of this event. Therefore, I can’t even imagine why a woman needs to know exactly the day on which the conception occurred. However, many of us are trying to determine the date of conception of a child, and it must be admitted that this is quite difficult to do.

How to determine the day of conception?

Calculating the exact date of conception, if it has already taken place, is simply unrealistic. It is only possible to determine the probable day of the conception of a child, but this date will never be 100% correct. This is because, in fact, conception can only take place during the period of ovulation. And if you do not calculate ovulation every month for a long period, then you can only approximately calculate the days on which it could take place in the last cycle. To do this, subtract 14 days from the date on which, according to your assumptions, the next menstruation should begin. It is believed that ovulation occurs on average 14 days before the start of the next menstruation: with a 28-day cycle, it occurs on the 14th day of the cycle, with a 30-day cycle - on the 16th, with a 24-day cycle - on the 10th, and so on Further. But this is a very arbitrary guideline.

More or less accurately, the date of conception can be determined by a specialist conducting an ultrasound examination. He will give you an approximate gestational age, which also cannot be considered unmistakably correct.

The fact is that ovulation can be influenced by a large number of different factors that are not able to take into account any of the known methods for calculating the date of conception and childbirth.

How to determine the day for conceiving a child?

If you are trying to determine the most likely or, then everything is much simpler here. To do this, you need to calculate with maximum accuracy the day on which you ovulate. There are many different ways to do this:

by basal temperature: ovulation occurs after a temperature drop, observed a day before the release of the egg from the follicle (there is a decrease in BBT by 0.1-0.2 degrees). Then, after the onset of ovulation, the indicators increase by 0.2-0.5 degrees and exceed 37 ° C;
according to the nature of the vaginal mucus: before ovulation, sticky and thick in the first phase of the cycle, vaginal discharge becomes viscous and transparent, like egg white. The release of a mature egg may be accompanied by damage to the blood vessels, which a woman observes with slight impurities of blood in the vaginal discharge in the middle of the cycle;
for ovulatory syndrome: some women with hypersensitivity may feel pulling pains from the active ovary and even complain of a short-term malaise during this period;
by using: works on the same principle as a pregnancy test, only unlike the latter, it reacts to an increase in the concentration of the so-called fertility hormone (LH - luteinizing hormone);
folliculometry method: the process of maturation of the egg is monitored by ultrasound, which allows you to accurately determine the day of ovulation.

In addition, an experienced gynecologist can determine quite accurately the approach of ovulation while examining a woman on an armchair.

The most reliable result can be obtained by combining several methods at once.

Few days to conceive

Finally, we note that even knowing the exact date of the sexual intercourse that caused the pregnancy, it is impossible to say with certainty that it is also the date of conception of the baby. After all, the path of sperm to the egg can take more than one day. Moreover, a sperm cell that has already arrived at its destination can wait for the egg to leave the follicle, if this has not happened yet. Therefore, experts say that theoretically, the conception of a child can take place as a result of sexual intercourse, carried out a few days before ovulation and a day or two after it.

Thus, you cannot accurately determine the day of conception of a child, but looking forward to his birth and becoming the best mother in the world for him is within your power! Is there anything more important?

Happiness to you!

Especially for Elena Kichak

Do you already know that you are pregnant? This is wonderful! But sometimes women have a completely logical question: when did the conception occur? And this question arises far from out of curiosity, but in order to determine the expected date of birth of the child as accurately as possible. What does a future mother need to know for this?

Calculate the day of conception

In order to determine the date of conception, you need to know two dates. The first is the first day of the last menstrual cycle, and for the second it is necessary to analyze the day. When there was sex. These two dates must be set as early as possible, because they can be forgotten very quickly, because all thoughts a little later will be occupied by a fairly quick birth and baby.

Then you can start counting. The normal gestational age is considered to be 280 days from the moment of conception. Or otherwise 40 weeks or 10 months. Sometimes the question may arise why 10 months, and not 9. Such a number due to the fact that the first day of the last menstruation is usually called the beginning of pregnancy. Although if you know exactly the date of conception, then the calculations are quite simple.

Probably many women asked the question of why gynecologists count only from the first day of menstruation. Namely, in the fact that girls in most cases do not remember when the last sexual contact was, and the whole secret lies. Although sometimes another equally interesting question arises when a girl tries to find out who the father of her child is. Such stupid situations arise when there are several sexual partners.

But sometimes women simplify their task with determining the date in that way. That they keep a special calendar where they mark their periods. So, you remembered when you had the first day of your last period. Then everything is very simple: you need to add 40 weeks to this date. Or vice versa, take away three months and add 10 days. The date and month that you get as a result will be the expected date of birth of your child.

Calculator for determining the day of conception

If your menstrual cycle is 28 days, then two weeks must be added to the first day of your last period. After all, it is in the middle of the cycle that ovulation and the conception of a child occur. But if your cycle is a little longer (30 days), then conception most likely occurred on the 15-16th. It is also interesting that most women believe that conception occurred on the very day when there was direct sexual intercourse. But this opinion is somewhat erroneous, because in some situations sperm can reach the egg for five days. This is affected by the quality of sperm and how mature the female cell is. Also known. That at the same time the egg is attacked by approximately 500 million spermatozoa, of which only one can fertilize it.

It is very important to know the approximate date of conception, because then you can find out the date of birth in order to prepare for them as much as possible. In order for the calculations to be more accurate, in addition to the medical assumption, you can use different online calculators. Calculate now with the online conception calendar.

But at the same time, it is worth remembering that it is unrealistic to calculate the exact date of birth. Only a small percentage of women give birth at the time that they were prescribed by a gynecologist. After all, a child can be born both at 38 weeks and at 42. And this will be considered quite normal and not beyond the scope. But still, it is better to know at least approximately when the baby can be born and start preparing in advance for his arrival.

If you want to know how to calculate the due date, then it is here that you will find answers to all your questions about this. You can calculate the date of birth by the date of conception, as well as by the last menstruation. If you have access to the Internet, then you can calculate the moment of the birth of a child online for free.

If you do not really trust the online calculator, you can calculate the approximate date of birth yourself, guided by special formulas. We will also talk about them in this article. The exact date of birth is difficult to calculate, since the child himself decides when he will be born. So, let's talk about everything in order. How to calculate the date of birth so that it exactly coincides in the future with the birth of a child.

due date calculator

Determining the due date: What are the ways to determine the approximate due date?

So, you took a pregnancy test and it came out positive. Now we calculate the moment of birth of the child. The date of birth is considered differently. There are several ways. We will talk about all of them. Let's first list the possible options for calculating the approximate date of birth. Here they are:

you can determine the date of birth both online and without the Internet by the date of conception;
you can calculate the date of birth by the last menstrual period.

Both of these methods can be used together. They do not exclude each other. The most correct option for calculating and calculating the upcoming birth and gestational age in weeks, as well as the size of the fetus, is, of course, ultrasound diagnostics. With the help of it, gynecologists determine the most accurate moment of the birth of a child. He will also determine whether you yourself will be able to give birth or you will need to do a caesarean sectionif the size of the fetus is large or the baby lies incorrectly. He will also explain who assigns and pays a woman child care benefits during maternity leave (employer or FSS). But we will talk about those methods for determining the date of birth and gestational age, for which you do not need to leave the house and even get up from your favorite sofa. After all, you can find out everything using the Internet.

How to calculate childbirth by date of conception?

To calculate the expected moment of birth of a baby by the date of conception and determine the gestational age in weeks, you must have a regular menstrual cycle and know when ovulation occurred. After all, conception is possible only during ovulation. Well, we are not even talking about what else you need to remember the day on which there was intimacy with your loved one. It's obvious. If, suppose, most women have 28 days of menstruation, then ovulation, as a rule, occurs on the 14-15th day.

But it is worth noting that the conception of the fetus might not have occurred on the day of sexual intimacy. It has been noticed that spermatozoa are able to live even for 3 days, “walking” while inside a woman. Therefore, here the approximate moment of the birth of the fetus by the date of conception will be determined approximately, and not day by day. The error can be even one or two weeks. So, now you need to add 280 days to the day of conception (this is exactly how much the average pregnancy lasts for most women). So you calculate and determine the date of birth at conception and the gestational age in weeks. It's pretty simple if you have a regular menstrual cycle and a good memory.

If you don’t want to bother yourself and want to immediately determine the day of your birth by conception and the gestational age in weeks, then use a special calculator on our website for this. Here it will be enough just to enter the estimated day of ovulation in the table and click the "Calculate" button. The computer will calculate and give the gestational age in weeks and the date of birth. As a result, you will know when the baby will appear and will look forward to this day and will no longer look for the answer to the question “How to determine the date of birth by conception”. This is a kind of fascinating fortune-telling that gives a correct prediction.

How to calculate the exact date of birth by menstruation and find out what week of pregnancy you are?

To calculate and find out the most accurate date of birth by menstruation, that is, to find out when we give birth, you should also have a regular menstrual cycle. The formula for calculating the moment of birth of a child based on the last menstruation of a pregnant woman is used in their practice by all gynecologists. They will certainly ask the future mother who came to see them about the first day of the last menstruation. There are probably no such pregnant women who were not interested in the first day of the last menstruation by gynecologists.

So, we calculate the approximate birthday of your child and find out how to determine the date of birth by the last menstrual cycle (by its first day). In order to start calculating the preliminary day of childbirth, from the first day of the last menstruation, you must count three months ago, and then add seven days. So it turns out the approximate day of the birth of a child.

If you don’t want to count in your mind, you can calculate the moment of birth of the baby using an online calculator, which, after entering the data, will give you the due date and which week you are automatically. To do this, simply enter the first day of the last menstrual cycle in a special calculator window, as well as the average duration of menstruation and the duration of the luteal phase (for most women, it lasts two weeks, that is, 14 days). Next, click the "Calculate" button and wait for the results of the online test. Almost every woman used such a calculator. It is popular at the moment.

Now you know how to calculate the due date, the calculator will always help with this. And also, now it’s not a problem for you to find out the duration of your pregnancy in weeks and even days. We hope that you will make the calculation correctly and without much difficulty and with great pleasure and in the future make sure that the actual day of the birth of the child coincides with the one given by the calculator! In the future, the question “How to determine the date of birth online” will not arise for you. Read about how to determine the date of birth by ultrasound and fetal movements, as well as how to bring the date of birth closer and get pregnant using IVF in other articles on our website.

Pregnancy is the most important stage in the life of any mother. The health of the future baby depends on the preparation for it and its course. To determine the exact duration of pregnancy and childbirth, the date of fertilization is important. There are several ways to determine the date of conception, it remains only to choose the most optimal one.

It is well known that a woman can become pregnant only during the ovulatory period. Directly at these hours, the female cell, ready for conception, leaves the ovary in the direction of the uterus. The life expectancy of an egg is small and rarely exceeds 36 hours, so the chances of conceiving a child during one cycle for spouses are negligible. When spermatozoa penetrate the vagina, under the most favorable conditions, a tiny part of them can live there for about a week. That is why the process of conception can take place a few days before and on the day of ovulation. How to determine the day of fertilization?

With one sexual intercourse, about 500 million spermatozoa enter the vagina, which modestly accumulate at the posterior vaginal wall next to the cervix. For conception to occur, the sperm must reach the mature egg in order to properly fertilize it. For this, the spermatozoon has a rather difficult path:

First, it passes 2 cm of the cervical canal;
Then overcomes 5 cm of the uterine cavity;
Then his task involves overcoming 12 cm of the fallopian tube.

Only after passing the cherished 19 cm, the sperm enters the meeting point - the ampullary section, where the “date” with the egg takes place. It takes about three hours for sperm to overcome this path, and the female body strongly opposes this process. In fact, the vagina is an aggressive environment for spermatozoa, in which most of them die. During the period of being in the vaginal environment, the spermatozoon dies after 2 hours. Therefore, a sufficient number of viable and active sperm is important for fertilization.

Process features

Many of the spermatozoa cannot reach the egg, becoming entangled in the epithelial layer of the fallopian tubes. But they can wait here for the release of the egg, since they are able to live here for about 5 more days. At the same time, favorable conditions for fertilization at 37 ° C are created at the meeting point of the sperm and the egg. But getting to the egg is not enough, you still need to break through its defenses. This is also taken into account by nature, therefore, in the head of each sperm there is a specific enzyme that dissolves the membrane membrane of the egg. When one spermatozoon manages to fertilize a female cell, the composition of its shell changes so that not a single sperm can get inside, which die within 48 hours.

The egg enters the uterus approximately four days after fertilization has occurred. Attachment takes another three days, after which the conception can be considered accomplished. It was at this time that chorionic gonadotropin begins to actively enter the blood, which is determined by rapid pregnancy tests.

When conception happened

To determine the day of conception, it is necessary to accurately calculate the ovulatory period, then compare it with the date on which unprotected intercourse occurred. Conception usually occurs in the middle of the female cycle. Therefore, with a monthly cycle of 28 days, you need to count 14 days from their beginning. In a similar period, the ovulatory process and conception occur. When making a calculation, it is necessary to take into account that sperm can fertilize a female cell only for a day and a half, but the viability of sperm can last up to 5 days (for some, up to a week). Therefore, even knowing the number of sexual contact that has occurred, you should not expect that it will coincide in date with conception.

There are two types of gestation periods - true or obstetric. The true or specific period is counted from the ovulatory period and the moment of fertilization. He usually lags behind obstetric by about half a month. The obstetric period can be calculated by relying on and comparing certain factors such as the beginning of the maturation of the female germ cell, the formation of the fetal egg and the formation of the fetus. This calculation starts from the start date of the last menstrual bleeding.

Proven Ways to Calculate a Date

There are other proven methods for determining conception. After confirming the fact of pregnancy, the obstetrician asks every woman at a gynecological appointment in detail when the last menstruation began, the duration of the cycle and other information of this kind. Some doctors, in order to determine the exact date of conception, are guided by the period of the menstrual delay, although the main reference point is still the day the menstruation begins. Therefore, women are advised to keep a women's calendar, in which you need to enter all the information regarding the beginning and end of menstruation. There are several proven options for finding out the date of conception.

With the help of a gynecologist. This period and date of fertilization will be very relative, in order to more accurately determine the date of conception of a child, additional examinations and medical calculations must be carried out.
Calculate the due date for the last menstruation. This is a fairly common technique, but it is applicable only when the cycle is constantly the same, does not float and does not go astray, menstruation constantly comes on a certain day. In cases where the cycle is constantly shifting to a decrease or increase in days, it will be quite difficult to calculate when exactly delivery will occur.
When registering, each woman is sent for ultrasound diagnostics, where the date of conception is determined, as well as the gestation period. The ultrasound method is the most reliable, only such a study can show the presence of pregnancy only at a 5-7-week period, not earlier. But you can find out when the baby should be born using ultrasound diagnostics in the period of 9-16 weeks. If the fetus develops with deviations (too large or small), then ultrasound can give erroneous calculations.

These methods are used by gynecologists to identify the exact day of conception and establish the timing of fetal development. In the process of calculations, it is necessary to take into account the individual characteristics of the mother's body, the presence of probable deviations in fetal development, etc. Also, one should not discount the fact that the newborn will be active for the birth a little earlier than the calculated period, or, conversely, will linger in the mother's womb for more for a week.

Calculator

So, in order to determine when conception took place, it is necessary to have information about two dates: the first day of the last menstruation and the days when there were sexual intercourse without contraception. It is recommended to write down these dates, because, as practice shows, they are forgotten quickly enough, and already at a gynecological appointment, it is difficult for a woman to remember when the last bleeding was. How to find out the desired date, knowing the above numbers?

Normally, the duration of gestation is 280 days from the day of conception. That's 10 months or 40 weeks. So, you know the date of the beginning of the last menstruation. You need to add exactly 40 weeks to this number. The resulting result will be the number when the baby is supposed to appear.

If you need to determine the date of conception of a child, then everything is also simple here. Ovulation occurs in the middle of the menstrual cycle. With its duration of 30 days, then fertilization will occur on the 15-16th day. The statement that the egg is fertilized on the day of sexual contact is erroneous. Sometimes several days pass between sex and conception, which depends on the degree of maturation of the egg, the viability and mobility of the spermatozoa.

What gives knowledge of the date

Knowing when conception occurred is important in order to calculate the time of delivery. In addition, such information will help control fetal development. Specific changes occur weekly with the fetus, in order to find out whether this is the norm or a deviation, it is necessary to reliably determine the gestation period. This will help control the processes of growth and development of the fetus, determine whether the pregnancy is proceeding favorably, etc.

In addition, knowing the exact day of conception, you can find out the exact date of birth, determine the time when mom goes on maternity leave, etc.

Conception period

It has already been noted that even with the exact date of sexual intercourse that led to the onset of pregnancy, it is impossible to consider this day as the date of conception with absolute certainty. Since spermatozoa can reach the female cell for several days, conception can also be determined by several days, covering the ovulatory period. When patients are interested in how to determine the dates of conception, doctors usually say that conception can take place after a sexual relationship that occurred a few days before the ovulatory period and a couple of days after it ends.

In obstetric practice, it is quite rare for childbirth to occur at the scheduled time, because a newborn can be born not at 40, but at 42 or 38 weeks, which is not a deviation. Therefore, the preliminary date of delivery should be treated as an approximate guideline.