If you are pregnant at the beginning of February, the due date should be in the first half of November. If you are pregnant at the end of February, the due date is in early December. For women with regular menstruation, the due date is calculated based on the time of the last menstruation, i.e. month minus 3 or plus 9, date plus 7. If the menstrual cycle is irregular, if you cannot remember the last menstruation, or if you are pregnant without menstruation while breastfeeding, the due date should be calculated based on the ultrasound report of the early pregnancy. The most accurate projection is to measure the length of the baby from the head to the buttocks in the ultrasound report. It can also be projected based on the date of fetal movement, which usually starts at 18-20 weeks after pregnancy, and the due date of the fetus for first-time mothers is the day of fetal movement plus 20 weeks, and for menstruating mothers is the day of fetal movement plus 22 weeks, but this is only a rough estimate. In the second month of pregnancy, pregnant women should have a timely maternity checkup to detect the development of the embryo through ultrasound and do general measurements such as height, weight, blood pressure, as well as blood tests such as routine blood count, liver and kidney function, blood type, infection quadruple, etc.