If you have your last menstrual period on April 25, your due date will be February 1 of the following year. Pregnancy is calculated from the first day of the last menstrual period, and the whole pregnancy lasts about 280 days (40 weeks). The due date is calculated by subtracting 3 or adding 9 from the month and adding 7 to the number of days, so the due date of the last menstrual period on April 25th will be February 1st of the following year. The week of pregnancy can be checked by early pregnancy ultrasound under the guidance of a doctor to ensure that the week of pregnancy is correct. Prenatal checkups should be conducted in a reasonable and standardized manner in accordance with the doctor’s instructions during pregnancy, so that pregnancy complications can be detected in a timely manner and standardized instructions and treatments can be given. At the same time, it is also possible to assess the safety of the pregnant woman and the fetus, and to determine the mode of delivery and the timing of the delivery, so as to reduce the risk of pregnancy and ensure the safety of mothers and infants.