Generally, pregnancy can be detected by blood sampling about 10 days after intercourse, but there are individual differences. When women of childbearing age have intercourse during ovulation, fertilization occurs within 24 hours after ovulation, and the embryonic trophoblast cells begin to secrete HCG (human chorionic gonadotropin) about 1 day after fertilization, after which the embryonic trophoblast cells will implant in bed in 6 to 7 days. Therefore, a blood test for HCG can detect pregnancy about 10 days after intercourse, but for women with long menstrual cycles, the test should be delayed appropriately. After the pregnancy is confirmed by blood HCG test, ultrasound examination must also be performed at about 6 weeks after menopause to confirm a normal intrauterine pregnancy. During early pregnancy, as the embryo development is still unstable, it is necessary to pay attention to not to be tired and strenuous exercise, continue to take folic acid on time as prescribed by the doctor, increase the diet and nutrition, and follow the doctor’s instructions to take obstetric examination on time.