Patient's question:
It's very frightening when this happens. I often experience lower abdominal pain, and I don't know how to solve it. So I came here to consult. Could you please explain why pregnancy is calculated from the first day of the last menstrual period?Doctor's answer:
!Since it is difficult for every pregnant woman to accurately determine the time of conception, medicine stipulates that the estimated due date should be calculated from the first day of the last menstrual period. The entire pregnancy lasts for 280 days, which is equivalent to 10 gestational months (each gestational month being 28 days). Adding 9 or subtracting 3 from the month of the last menstrual period gives the month of the estimated due date, while adding 7 to the day of the last menstrual period gives the day of the estimated due date.