How to accurately judge the length of your pregnancy It is very important for expectant mothers to be able to accurately judge the length of your pregnancy. This is because the length of pregnancy is directly related to the prediction of the date of delivery and the development of the fetus. So, how to accurately determine the length of your pregnancy? Next, we will elaborate on it from four aspects. Aspect 1: The menstrual cycle of women before conception is 28 days, and through statistical cycles, it can be seen that the ovulation period is usually around 14 days of the menstrual cycle. Therefore, if an expectant mother can determine the first day after conception, she can calculate the length of pregnancy by adding and subtracting