The hcg, also known as serum human chorionic gonadotropin, is a hormone secreted by gestational trophoblast cells and is the main clinical indicator of pregnancy status. In some women, serum hcg rises gradually with the development of the embryo until it reaches its peak value. If there is a decrease in serum HGH in the early stages of pregnancy, it is mostly due to abnormalities in the development of the embryo. If the embryo is not developing well, the gestational trophoblast cells atrophy and die, and the serum gonadotropin secretion gradually decreases, the end result of this condition is the death of the embryo. It is important to note that there is a physiological decrease in serum HCGH after 8 weeks of gestation. This physiologic decrease is normal and does not require special treatment. The decrease is usually small and the level is maintained for a long time after the decrease. It is recommended that pregnant women who notice a decrease in serum human chorionic gonadotropin visit their local hospital regularly to monitor the changes in serum human chorionic gonadotropin dynamically. In summary, a decrease in serum HGH requires prompt medical attention and monitoring of blood values.