If pregnant in early February, the due date would be in early to mid-November. If the pregnancy occurs at the end of February, the due date would be in early December. For women with regular periods, the due date is calculated based on the time of the last menstrual period, i.e., the month minus 3 or plus 9, and the date plus 7. Mothers with irregular menstrual cycles, those who can’t remember their last menstrual period, or those who became pregnant without having a menstrual period while breastfeeding should base their due date on the ultrasound report of the early stages of pregnancy. The most accurate projection is through the ultrasound report inside, measuring the value of the length of the fetus from the head to the buttocks. It can also be estimated based on the date of fetal movement, which usually starts at 18-20 weeks after pregnancy, and the due date of the fetus is the date of fetal movement plus 20 weeks for primigravid women, and the date of fetal movement plus 22 weeks for transgravid women, but this is only a rough estimation. In the second month of pregnancy, pregnant women should undergo a timely obstetric examination, through ultrasound to detect the development of the embryo and make general measurements, such as height, weight, blood pressure, but also blood tests, such as routine blood, liver and kidney function, blood type, four infections, and so on.