How to accurately calculate pregnancy date? The date of pregnancy is a very important data for expectant mothers, but many people often make errors due to calculation errors. So, how to accurately calculate the date of pregnancy and avoid errors? Below we will elaborate on the following aspects. Aspect 1: Understand the menstrual cycle The menstrual cycle is the basis for calculating the date of pregnancy. Generally speaking, a woman’s menstrual cycle is 28 days, but in fact everyone’s cycle may be different. Therefore, when calculating the date of pregnancy, you should base it on your own Menstrual cycle is used for calculation. First, we need