Last menstrual period was on March 8 and the due date is around December 15 if the period is regular. If menstruation is not regular then it needs to be calculated based on early ultrasound. The due date of a pregnant woman is calculated according to the last menstrual period under the premise of regular menstruation, usually the month minus 3 or plus 9, and the day plus 7, which is the due date. However, it should be noted that the due date is also an estimated date, and it is normal to be 1 week early or late. If there is no sign of labor on the due date, you can first complete the examination for observation, if there is any discomfort, consult a doctor in time. If the pregnancy week has reached 41 weeks, it is recommended to come to the hospital to consult a professional doctor to decide the mode of delivery according to the individual’s situation. It is recommended to do a good maternity examination at every period of pregnancy, if there is any discomfort, go to the hospital as soon as possible to check the condition of the mother and fetus.