Pregnancy can usually be detected by a blood test about 10 days after intercourse, the longer the test result, the more accurate it is. Usually, early pregnancy can manifest itself in the form of delayed menstrual cycle, chest tightness and nausea, and frequent urination. It can usually be detected about 10 days after intercourse by taking venous blood to check the concentration of human chorionic gonadotropin, and can be diagnosed as early as 1 week after intercourse. The easiest way to confirm the diagnosis is to take a urine pregnancy test and then take a blood test for HCG if the result is not confirmed. In addition, since the fetus is unstable and prone to miscarriage in the early stages of pregnancy, women should pay attention to regular work and rest, avoid staying up late and heavy physical labor, and quit smoking and drinking. They should also stay away from radiation or other chemical agents and take folic acid tablets to reduce the incidence of fetal malformation. In addition, once a woman is pregnant, she should undergo regular maternity checkups, usually around 40 days of pregnancy through ultrasound to rule out the possibility of ectopic pregnancy and other diseases.