There is also a calculation method for the date of pregnancy. Pregnant women who do not know how to calculate it usually assume that their period will not start counting, but in fact, it is not necessarily calculated that way because calculating pregnancy in medicine is different from calculating the number of months in daily life. So, when should pregnancy be counted?
The normal duration of pregnancy is about 40 weeks, and in medicine, the first day of the last menstrual period is often used to calculate the expected delivery date. The normal duration of pregnancy is about 265 days (calculated from the day the egg is fertilized), and ovulation occurs in the middle of menstruation. Therefore, a pregnancy at 40 weeks (280 days) is 2 weeks longer than the actual conception of the egg. If a woman's menstrual cycle is defined as 28 days, then a 280 day pregnancy is equivalent to ten months of pregnancy or ten menstrual cycles, hence the term 'ten month pregnancy'.
The due date can only remind pregnant women of the safe time range for the birth of the fetus, but do not make the due date so precise. The due date is not an exact delivery date. According to statistics, only about 53% of pregnant women will give birth on the day of their due date.
The exact time of birth for a fetus is influenced by factors such as the intrauterine environment, fetal development, the physical condition of the pregnant woman, and the actual environment, and cannot be accurately predicted. The expected delivery date is only an approximate time for a pregnant woman to give birth. The purpose of calculating the expected delivery date is to prepare the pregnant woman to be a mother, not to calculate which day to actually give birth on.
