For example, when the fertilized egg has not been transplanted to the uterine cavity for growth and development, the corpus luteum of the ovary has not yet secreted human chorionic gonadotropin, and the HCG level is still within the normal range and has not increased, it is better for women to retest the HCG level after a week. It is best to retest the HCG level after a week. Normally, when a woman is not pregnant, the HCG level is less than 1.0 IU/L. After pregnancy, with the prolongation of menopause days, especially in the third trimester, the HCG level will gradually increase, rising to the peak in the 10th week of pregnancy, and then will slightly decrease until the end of pregnancy.