HCG is also known as human chorionic gonadotropin, which is secreted by the trophoblast layer of the placenta and can promote ovulation if ovulation is impaired. If the HCG value is low after pregnancy, preterm miscarriage is likely to occur and HCG injections are needed to preserve the pregnancy. HCG injection is needed for IVF, and the dosage used varies according to the condition. After HCG injection, it is necessary to pay attention to rest, reduce strenuous exercise, pay attention to diet, and consume less stimulating food.