How to calculate the date of birth by menstruation?

2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21

Every pregnant woman should and wants to know when she should expect replenishment in the family. To do this, you will have to understand how the date of birth is calculated. The thing is that this is not the most difficult process. Moreover, the girl can cope with setting the expected date of birth on her own. It is enough to simply understand how experts determine the DA. Everything is much easier than it might seem at first glance. True, the data obtained cannot be called 100% reliable - the female body can present a "gift" in the form of later / early birth under the influence of external factors, as well as due to incorrect calculations.

On the development of pregnancy

How to calculate the exact due date? Unfortunately, childbirth is a process that is difficult to control. Experts can calculate the DA, but no more. The expected date of birth is a guideline, but not a guarantee that the girl will give birth on the specified day.

First you need to understand how conception occurs. This process is carried out during the fertilization of the egg. First, the follicle matures in the girl's body (starting from the first day of the menstrual cycle), then ovulation occurs. It is at this point that the chances of pregnancy will be highest. If during ovulation or 3-4 days after it, the egg collides with spermatozoa, and they fertilize it, we can talk about successful conception.

The fertilized egg reaches the uterine cavity, it forms a fertilized egg. It is attached to the uterus, after which we can talk about the pregnancy. But how to calculate the day of conception by the date of birth? What about defining the DA?

Methods for determining the term of "interesting position"

How is the due date calculated? In modern medicine, there are various ways to solve the problem. Next, we will try to consider them in detail.

Among the existing methods for determining the date of birth use:

• method "by monthly";
• according to a special calendar;
• using ultrasound;
• using movement tracking;
• by ovulation date;
• using digital pregnancy tests.

It is recommended to use all these techniques together. Then the girl and the specialist doctor will be able to get the most reliable information.

About duration of pregnancy

Thinking about how to calculate the estimated date of birth, every woman should understand how long the "interesting position" lasts. The DA depends on it.

A normal pregnancy lasts 9 months - 40 weeks. It is for this period of time that it is customary to set the PDR. However, labor can begin at any time, most often from the 37th to the 42nd week of the "interesting position". Therefore, the DA is a kind of guideline.

Important: under the influence of external factors or heredity, a woman can give birth even at the 25th week. This is a pathology, but it still occurs. It is almost impossible to predict it.

By menstruation

How to calculate due date from last period? This is the simplest solution for those who want to understand when labor is expected to begin. You can deal with this problem at home. It is enough to carry out the simplest mathematical calculations.

When menstruation is delayed, a girl should take a pregnancy test or donate blood for analysis (hCG concentration). If the pregnancy is confirmed, it is worth remembering when the girl had her last menstruation. How is the due date calculated from menstruation? For this, the Negle formula is used.

90 days are subtracted from the first day of the last period, and then a week is added. This is the estimated date of birth. Everything is easy enough, but this solution is not the only one.

Important: determining the gestational age by the last menstruation is the obstetric term of the "interesting situation".

According to ovulation

How to calculate the date of birth by menstruation, found out. But this is far from the only scenario. You can cope with setting the estimated date of birth by ovulation. Such a techniquedoes not occur too often, but it allows you to understand the real term of the "interesting situation".

If a girl knows when she ovulated, and also take into account the duration of the menstrual cycle. Normally, the latter is about 26-30 days. In this case, ovulation occurs on the 14-15th day of the new cycle.

After you managed to calculate the date of ovulation, you just need to add 280 days to the resulting number. At the exit, you will be able to see the estimated day of delivery.

By date of conception

But that's not all. Some try to calculate the date of birth from the date of conception. Is it possible to do so? Yes, but this is the least accurate method. It is connected with the fact that it is problematic to understand when conception occurred. Especially with an active sex life.

Assume that the moment is known. Then, in order to calculate the date of birth by the date of conception, 38 weeks must be added to the information received. This is the DA.

Important: to understand when conception occurred, it is recommended to keep a basal temperature chart for several months of pregnancy planning.

Tests to help

How is the due date calculated? Modern technologies are actively developing, opening up new opportunities for people. And in the field of definition of "interesting situation", as well as its term and DA too.

For example, some people use digital pregnancy tests to achieve their goal. Some such devices show not only the presence of an "interesting position", butand his term. It is very convenient.

To achieve the desired result, the girl is advised to take a digital pregnancy test, and then see how long it gave on the day of the study. You need to subtract it from today (those when the test was taken), and then add 40 weeks.

Important: this technique is not always accurate.

Ultrasound help

Calculate the estimated date of birth, as you can see, it is possible in various ways. True, all the proposed methods are not 100% reliable. The body can present a "surprise" at the most unexpected moment.

The most accurate way to determine the gestational age, as well as the EDD is to conduct an ultrasound examination of the pelvic organs. A specialist doctor will be able to assess the condition of the fetus, and then report the estimated day of delivery from it.

It's easy to guess that you won't be able to use this technique on your own - you must definitely contact a specialist doctor in a clinic or a private medical center. But it is this solution that is the most accurate and reliable.

First movements

Not all girls know about the next method of solving the problem. The thing is that you can understand when to expect childbirth by the first baby movements. This technique is very rare in practice.

How to calculate the date of birth by the first movement? Scientists note that the first movements of the mother’s baby, waiting for their first child, feel “interesting” at the 20th week.position . Girls who have become mothers for the second or more times - on the 18th.

Accordingly, 20 or 22 weeks will have to be added to this or that date. True, this approach often gives strong errors. Some girls feel movements both on the 17th and on the 15th week of the "interesting position". It is because of such inaccuracies that this method is abandoned. True, if there is no other way to calculate the date of birth at the moment, you can use it.

Special calendar

How is the due date calculated? It's hard to believe, but now almost all gynecologists have special gynecological calendars. They are made in the shape of a circle.

During an appointment with a gynecologist for pregnancy, a specialist, as a rule, asks the woman to tell the date of the last menstruation. In addition, he examines the data on the blood test (if available), and also conducts an examination on the chair.

Based on the data obtained, the gynecologist gets the impression of the expected date of conception. All that remains now is to use the calendar. The gynecologist sets a mark near the date of the last menstruation, and then sees the PDR in a specially designated window. Very convenient!

Important: this technique is usually based on the use of the Wenge formula.

Online mode

How to calculate the date of birth by ultrasound and not only, we found out. It is advisable not to do the calculations yourself. For this, it is better to involve medical specialists. Pregnancy itself is unpredictable, sothere is a high probability of incorrect determination of the PDR. In addition, modern technologies help to notice the pathology of pregnancy. And this, in turn, suggests what the likelihood of preterm birth.

How is the due date calculated? The answer to this question will no longer put a woman in an awkward position. However, all the tips listed above are not exhaustive. Some girls trust special online calculators. They usually allow you to calculate by the date of the last period.

To calculate the estimated due date in this way, you need:

1. Go to the site with an online pregnancy and childbirth calculator. Such services can usually be found on various women's forums.
2. Indicate the date of the last menstruation. Usually refers to the first day of the last period.
3. Set the duration of the menstrual cycle.
4. Click on the button responsible for starting the calculation.

In a few seconds, the girl will see the PDR on the screen. Fast, simple and very convenient! And most importantly - reliable and free. True, it is not recommended to rely completely on such a technique, like most of those listed earlier.

Possible difficulties

How to calculate the date of birth by menstruation is now clear. But what challenges might some women face?

First, with premature birth. Fortunately, they can often be predicted by careful observation of fetal development.

Secondly, girls withirregular periods. As a rule, their PDR is determined with the help of specialist doctors, but they can also be mistaken by several weeks.

Thirdly, it is not always possible to accurately determine the exact date of conception of the baby. This creates some difficulties when setting the DA on their own.

No intercourse - there is a pregnancy

Calculating the date of birth from the date of conception is not as difficult as it seems. And put the PDR in the form of an approximate guideline for childbirth, too. Some girls experience unplanned pregnancies. For example, in the absence of sexual intercourse on the day of ovulation. Can this really happen?

Yes. The thing is that male spermatozoa can live in a woman's body in anticipation of an egg ready for fertilization for up to 7-8 weeks. Unprotected intercourse, which took place a week before ovulation and 3-4 days after it, can indeed lead to pregnancy. This should be taken into account when contacting a gynecologist.

True, EDD is not calculated by the date of sexual intercourse. But with the help of it, it is sometimes possible to predict the day of conception of the baby. And use this information in the future.

Conclusion

Now it's clear how the due date is calculated. Modern girls can cope with a similar task in various ways. Most of them are easily mastered at home.

Despite the variety of methods offered, it is better to entrust the setting of the due date to specialist doctors. They will be able to cope not only with this task, but alsosee how well the fetus develops. Moreover, doctors help to calculate both the actual gestational age and the obstetric one. These periods will differ by approximately 2 weeks. This is due to the fact that the first is placed by the date of conception, and the second - by the first day of the last menstruation. Everything is extremely simple and clear.

In any case, calculating the expected date of birth in today's realities is not so difficult. Each woman can independently choose the method of calculation that seems to her the most simple and accurate.