What is due date
The expected date of delivery, as the name suggests, is the estimated date of delivery of a pregnant woman. Generally speaking, this date is calculated by measuring the first day of a pregnant woman\’s last menstrual period. If a woman\’s menstrual cycle is relatively stable, the estimated due date will be more accurate. However, if there are special circumstances, such as irregular menstruation and pregnant women suffering from polycystic ovaries and other diseases, the date algorithm needs to be adjusted.
Generally speaking, the expected date of delivery should be the 40th week of pregnancy. But in fact, it is normal for the baby to be born earlier or later.
How to calculate the due date
There are many ways to calculate the expected date of delivery during pregnancy, one of which is the Naegele formula. This formula is very simple. It is based on the first day of a woman\’s last menstrual period, plus 7 days, and then subtracts three months. For example, if the last menstrual period was November 1st, then it would be November + 7 days – 3 months = August 8th.
Of course, if menstruation is irregular or women have polycystic ovaries, it is necessary to use ultrasound to measure the size and development of the fetus, and then calculate the expected date of delivery based on the development stage. The doctor will conduct detailed examination and diagnosis and make an accurate estimate of the due date.
Error in due date
Even with the most advanced calculation methods, the expected date of delivery cannot be 100% accurate. A delay of 2 weeks before and after delivery is considered a normal delay for pregnant women. Therefore, if the expected date of delivery exceeds 2 weeks, pregnant women should contact their doctor in time for further examination.
If the date is calculated based on the expected date of delivery, some confusion often arises. If your due date is July 15th, when did you get pregnant? In fact, this date is calculated from your last menstrual cycle. Assuming this cycle is 30 days, then the start time of your last menstrual period is June 5th.
Summary
The expected date of delivery is the estimated date of delivery for a pregnant woman. The Naegele formula is a simple method to calculate the expected date of delivery, but the final result may contain errors. The calculation of the expected date of delivery is not limited to the menstrual cycle, but also takes into account the physical condition of the pregnant woman and the development of the baby. During pregnancy, pregnant women must consult and inquire with their doctors to ensure safety and health.
