Online pregnancy calculator from the day of conception. Calculate Due Date with Calculator
A woman, having learned from a doctor about her desired pregnancy, will definitely want to find out the “age” of the future crumbs. There are several ways to determine the date of birth of the baby, both independent and with the help of specialists. How to correctly calculate the gestational age, as well as how the real term differs from the obstetric one, we will try to tell in this article.
The obstetric term, which is set by gynecologists at the first appointment for a future mother, differs markedly from the real one, but is the most accurate parameter. It is believed that pregnancy occurs at the moment of direct conception or fertilization of the mother's egg. This usually happens around the middle of the menstrual cycle, so if a woman knows the day when the egg leaves the follicle and ovulation begins, then she can accurately calculate the gestational age.
Basal body temperature (BT)
To do this, you need to daily, remaining in a horizontal position in bed, measure the temperature by the rectal method. After menstruation, in the period of 10-14 days, it most often does not exceed 37 degrees, and during and after ovulation, it can rise to 37.2-37.3 degrees. The day of conception does not always coincide with the time of sexual intercourse. The sperm cell has the ability to survive from three to seven days in anticipation of the appearance of the egg from the ovary. And the lifespan of the mother cell itself is limited to 24 hours. Therefore, if sexual intercourse occurred 5-7 days earlier than ovulation occurred, then conception can occur 5-7 days later than coitus. Therefore, experts argue that this method of counting for determining the embryonic period is not entirely accurate. In addition, each woman, due to her individual characteristics: a certain menstrual cycle, the day of ovulation and the possibility of re-emerging an egg from the ovaries, will have her own fetal development period, which cannot be determined one hundred percent.
In obstetric practice, the date of the first day of the last menstruation is used. The error of this method is only 7-14 days. The obstetric period is calculated in two ways: 10 average menstrual cycles (28x10) or 280 days are added to the first day of the last menstruation; in the second case, 3 months are subtracted from the same date and 7 days are added (Negele's formula). In the ideal case, when the exact date of ovulation is known (days 12-16 of the menstrual cycle), 264 days can be added.
Note! At the appointment with the gynecologist, the expectant mother will find out the obstetric period, since doctors do not take into account the rest of the calculations.
Ultrasound procedure
For many years, the ultrasound method has been quite actively used in the diagnosis of fetal development. The most accurate gestational age is obtained using studies conducted at the earliest stage of pregnancy - up to 8 weeks. The development of healthy embryos these days is identical and it is possible to determine the gestational age up to a day by the size of the fetus. In the future, the children begin to show their individuality, any healthy fetus may have minor deviations (for example, growth is slightly below normal or the size of the head is slightly larger). If this difference fits within a period of no more than 7-10 days, then doctors usually do not take this circumstance into account, but if it is a period of two or more weeks, then doctors diagnose intrauterine growth retardation and recommend paying attention to proper balanced nutrition , walks, a healthy lifestyle that will help normalize the development of the embryo.
A gynecologist's consultation on the first day of pregnancy delay is usually not needed, since the doctor will not yet be able to determine whether the uterus is enlarged as a result of PMS or conception. The perceptible growth of this female organ in connection with pregnancy begins only at the end of the first trimester. In the second or third week of delayed menstruation (for a period of 5-6 weeks), the uterus reaches the size of a chicken egg, at 8 weeks - goose, at 10 - usually acquires the size of a female fist.
HCG and gestational age
How to correctly calculate the gestational age using human chorionic gonadotropin? Ideally, a blood test from a vein is not used to determine the timing of an “interesting situation”, but for the early diagnosis of possible complications. In the second week, an approximate table of hCG values in the blood of a pregnant woman contains a parameter from 25 to 150 IU per ml, and in the eighth - up to 70 thousand IU per ml. Serious deviations from the table values indicate a serious pathology, such as missed or ectopic pregnancy.
First fetal movement
Doctors say that for the first time pregnant women, the feeling of the inner presence of the baby occurs exactly at 20 weeks of pregnancy, for re-pregnant women - at 18 weeks. This date is an important step in the correct calculation of the gestational age. It is easy to notice the movement, especially when lying on your back.
Uterine length
Starting from the second trimester of pregnancy, gynecologists measure the length of the uterus with a centimeter tape in the patient lying on the couch. In a future mother, the uterus adds about a centimeter in size every week. In addition, there are special tables that can be found in manuals on gynecology and obstetrics.
Heart tones
The embryo's heart begins to beat already at four and a half weeks (or 2-3 weeks after a woman's period is missed). This is noticeable in early ultrasound examinations. Through an obstetric stethoscope, the fetal heartbeat is heard much later, approximately after the date of the beginning of the movement of the future crumbs. Poor hearing can be caused by a placenta located closer to the anterior wall of the uterus or significant abdominal deposits of adipose tissue.
No matter how hard you try to correctly calculate the gestational age to the day, most likely it is unlikely to succeed. This can only be done hypothetically. Your baby will be born into the world only according to the laws of Mother Nature, when he is ready for this. Good luck in this difficult and noble cause!
Video
You can learn more about calculating the gestational age from the following video:
The calculation of the expected date of delivery (ED) can be done in several ways, and each of them will be only indicative. Each gynecologist has a "favorite" method on which he relies. But the deviation of the date of birth from the calculated one is a variant of the norm.
The proposed method - on the first day of the last menstruation. Suitable for women with a regular cycle of 28 days.
How to use the calculator
Just enter in the field the date of the first day of the last menstruation - and press the button "Find the date of birth".
How else can you find out the gestational age and date of birth
1. In the first trimester, you can find out the gestational age with high accuracy right at the gynecologist's appointment. He will determine the period without any tests, simply by the size of the uterus. In the 2nd and 3rd trimesters, this will no longer work.
To make calculations in this way, you need to add 280 days to the date of ovulation.
You can use the date of sexual intercourse as the initial data (keep in mind that the fertilization of the egg can occur on the 2nd, or even on the 3rd day after it.
3. Hardware calculation of gestational age and date of birth using ultrasound. By this method, the period can be determined with an accuracy of 1-3 days.
With the help of ultrasound, a specialist can observe the condition of the fetus, placenta, the position of the baby's head in relation to the entrance to the small pelvis, the size of the opening of the cervix and other important parameters. That is why this method is highly accurate.
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DATE OF PREGNANCY Calculator
For many women, the feeling of an impending or already begun pregnancy occurs before the test shows two strips - that is, even before the actual delay. Scientists cannot yet explain these true premonitions, however, the concept of the Early Pregnancy Factor has already been introduced into the scientific lexicon, which describes the chemical reactions of the mother's body in response to an accomplished conception after just a few hours. Currently, there are already tests for the detection of the Early Factor hormone in the female body, but due to the significantly expensive cost, these tests are not produced on an industrial scale.
On average, childbirth occurs 10 obstetric months (280 days) after pregnancy, when the baby is ready to be born. However, it should be noted that 280 days is the conditional number of days of bearing a child. All women's bodies are different, and all babies mature differently in their mother's tummy. Someone will need 280 days, and someone will be "already ready" in 240 days. Only 2% of newborns are born on a precisely calculated day. Most of the kids - two weeks earlier, or a few days later than the appointed time. The duration of pregnancy and childbirth is calculated based on the date of the beginning of the last menstruation.
If we take into account all the changes that happen to the baby almost every day during pregnancy, and especially the first trimester, then in general these processes can be compared with the birth of a new universe in terms of importance and complexity, in depth. Every day of the little crumbs inside you is not just a step, it is a huge breakthrough, a breakthrough. The birth of a new life, despite the scale of accomplishments, does not require any external efforts for itself .. everything happens under the cloak of secrecy. After all, the fact that conception has occurred, and the woman herself finds out only after some time. Thanks to modern technology, scientists have managed to study a little the great secret of birth - that with which EVERYTHING begins. Enter your data and flip through the pages of the calendar of development of human life throughout pregnancy. Believe me, amazing discoveries are waiting for you!
Calculator
The pregnancy calculator allows you to calculate the exact due date and find out what week of pregnancy you are currently in, as well as the expected date of delivery. To calculate, select the date of the first day of your last period at the top of the calculator and click on the "Calculate" button. The calculator will then automatically display your current pregnancy week and expected due date.
For each week of pregnancy, two exact dates are displayed: the start day and the end day. The interval between them is exactly 7 days. You can scroll through the weeks of pregnancy using the arrows. The full list of weeks from 1st to 40th is at the very bottom of the calculator. By clicking on them, you can also scroll through the slider for the desired week. The trimester of pregnancy to which each week belongs is indicated by Roman numerals at the bottom (near the slider) and in the upper right corner of the cells (in the full list of weeks). Also, the trimesters are marked in pink, orange and blue, respectively. In general, the very concept of pregnancy trimesters is rather arbitrary and their boundaries are not clearly defined. We took as a basis the most common classification, in which the second trimester begins at the 14th week and ends at the 28th. Only your obstetrician-gynecologist can calculate trimesters more accurately after an ultrasound scan.
In the images you can see a rough illustration of the development of the baby inside the womb for each week. To the left of the images is a summary of the fetal growth for that week. For more complete and detailed information, you can find by clicking on the "More" link, which is located under each description.
Method for calculating the gestational age
The calculator calculates the so-called "obstetric" gestational age. It differs from the actual date by about two weeks. This calculation method is used in gynecology, because. it is very difficult to calculate the exact day of conception. Therefore, the calculation is based on the first day of the last menstruation, the date of which, as a rule, every woman remembers. 280 days or 40 weeks are added to this day. Thus, the first two weeks of the obstetric period you are not yet pregnant, because. ovulation has not yet occurred (based on an average menstrual cycle of 28 days). This method is not completely accurate because some women ovulate late or early. But, in general, for most expectant mothers, such a calculation turns out to be quite accurate.
In any case, we draw your attention to the fact that the pregnancy calculator allows you to calculate the term using the most general formula, which does not take into account the individual characteristics of your body. It cannot be used for self-diagnosis or any other medical purposes, since the results of its calculations are for informational purposes only. All precise calculations and any other manipulations should be done only by your attending physician.