During the first 8 to 10 weeks of pregnancy, hCG levels rise on average about 1-fold every 2 days. The main function of hCG is to increase the secretion of steroid hormones to maintain pregnancy, stimulate the production of luteinizing hormone, promote male fetal sexual differentiation, stimulate thyroid activity, etc. After production, it is excreted into the urine through the blood circulation of pregnant women and is in a parallel relationship. It is a compulsory indicator in gynecological pregnancy tests, through which the growth and development of the fetus can be monitored. Generally, during the first 8 to 10 weeks of pregnancy, the level of hCG value increases rapidly, averaging about 1 times every 2 days, which is the usual “doubling every other day” of pre-hCG. Under normal circumstances, during the 8th to 10th week of pregnancy, the secretion of hCG is the largest, and the value of hCG rises rapidly, generally up to 66% every 48 hours; if the rise of hCG is less than 66% every 2 days, it indicates the possibility of ectopic pregnancy or embryonic intrauterine pregnancy, and if hCG continues to decrease, it indicates the possibility of spontaneous miscarriage, which requires close attention. The hCG reaches its peak in the first 8 to 10 weeks of pregnancy, and close attention is needed to exclude abnormalities if it decreases during pregnancy.