Last menstrual period April 25th due date is February 1st, can be projected under the guidance of the doctor. The week of pregnancy should be calculated from the first day of the last menstrual period, the month minus 3 or plus 9, and the number of days plus 7. The week of pregnancy can be checked by a specialized physician based on the ultrasound examination of the pregnant woman’s early pregnancy. For those who can’t remember their last menstrual period or are pregnant during breastfeeding without a return of menstruation, ultrasound can be used to help estimate the expected date of delivery. Regular prenatal checkups during pregnancy, as prescribed by the doctor, will enable early detection of pregnancy complications and early intervention to ensure the safety of mother and baby during pregnancy. At the same time, standardized prenatal checkups can also assess the growth and development of the fetus and determine the timing and mode of delivery.