HCG (i.e., human chorionic gonadotropin) is above 40,000 IU/L at about 8 weeks of gestation. In normal pregnancy, HCG production begins when the fertilized egg is laid, i.e., on the 6th day after ovulation, when the trophoblast layer of the fertilized egg is formed, and peripheral blood HCG can be measured about 1 day later, rising 1-fold every 1.7-2 days thereafter, reaching about 100 IU/L on the 14th day after ovulation, peaking at 80,000-320,000 IU/L on the 60-70th day, and declining rapidly thereafter. In the middle and late stages of pregnancy, HCG is only 10% of the peak. Due to the poor quality of the embryo and its poor location in the uterine cavity, it cannot get enough nutrition supply, the HCG value will rise more slowly or even drop. The exact week of pregnancy is determined by the time of the last menstrual period and the ultrasound. After pregnancy is confirmed, pregnant women should undergo regular ultrasound examinations to clarify intrauterine pregnancy, exclude abnormal pregnancy and understand the development of the fetus. During pregnancy, pregnant women should relax, avoid excessive stress, eat properly and be active. In case of abdominal pain, vaginal bleeding and other abnormalities, go to the hospital at any time.