Most pregnancies last around 40 weeks (or 38 weeks from conception), so usually the best way to determine a due date is to count 40 weeks or 280 days from the first day of the last menstrual period (PDM).
Another way to do this is to subtract three months from the first day of your last period and add seven days. Thus, if your last period started on April 11, counting three months, will be 11 January, plus seven days. This means that your delivery date should be January 18.
We offer you to try these methods for the precise determination of the da.
Calculation of delivery date based on the first day of your last period works well for women with relatively regular menstrual cycle. But if your cycle is irregular, the method of the PDM may not work for you.
Important as a reliable estimated date of delivery (the da), you and your doctor can use the date of conception, if you remember her. Just add 266 days to get the approximate time.
In Ukraine annually, several thousands of cycles of assisted reproductive technologies, which are born every year thousands of children.
If you are part of a growing tribe of mothers ECHO, you can more accurately calculate due date, using the date of transfer IVF.
Even if you can’t pinpoint the time of conception, forgotten the day their last menstrual period or are not sure when ovulation occurred, other tips can help you and your doctor to determine the date of the alleged birth at the first prenatal appointment. Some doctors use ultrasound earlier.
Early ultrasound can more accurately determine the date of pregnancy. However, keep in mind that not all women can get it. Some practitioners perform them regularly, but others recommend only one ultrasound examination, if: your periods are irregular, you are 35 years old or more, you have a history of miscarriages or pregnancy complications, or the duration cannot be determined on the basis of your physical examination.
The course and symptoms of pregnancy, like the first heartbeat of a child (9 or 10 week), feeling the first movements of the fetus (on average between 18 and 22 weeks, but it could be sooner or later), can give clues as to your exact date of birth.
The height of the pelvic floor, which is measured from pubic bone to top of uterus, verified by your doctor at each prenatal visit and helps to confirm your date of birth.
The size of your uterus, which will be noted at the initial inspection for the presence of pregnancy can also be a factor in determining the da.
You can also try to determine when you got pregnant to “plan” the date of birth.
But even if you’re one of the fortunate ones that can get pregnant when you really want, just remember that you probably will not be able to accurately determine the exact date of birth.
Yes, your period can change. Although this is definitely not a cause for concern, your doctor may change the date of birth for a number of reasons with the development of pregnancy.
It can also be caused by the fact that you have abnormal growth or abnormal level of alpha-fetoprotein (AFP), a protein produced by the baby. Talk to your practitioner if you have any questions or concerns.