Serum human chorionic gonadotropin is a hormone secreted by the placenta that responds to the early development of the embryo in utero. The normal values of serum human chorionic gonadotropin in early pregnancy span a wide range, so focusing on specific values of serum human chorionic gonadotropin is incomplete. To assess fetal development, dynamic monitoring of serum human chorionic gonadotropin is required. Currently, most of the clinical methods for accounting for the gestational week are based on the time of menopause. However, due to the different menstrual cycles of different pregnant women and depending on the time of intercourse, this calculation is not particularly accurate. The normal range of serum chorionic gonadotropin fluctuates widely. Even if the serum HGH is within the normal range, a poor increase in the value is indicative of fetal failure. Therefore, it is currently considered that if the rate of increase of serum HGH is normal, then it indicates good fetal development. Under normal conditions, serum HGHs increase at a multiplicative rate. It doubles every 24-48 hours in the case of normal fetal development. Therefore, serum human chorionic gonadotropin at 35 days of gestation needs to be monitored dynamically to clarify the fetal development.