The normal value of human chorionic gonadotropin on day 40 of pregnancy is 13,730 mIU/mL. The value of human chorionic gonadotropin is determined in detail according to the menstrual condition of each individual, including the situation of ovulation, if the menstrual cycle is delayed for a longer period of time, or if ovulation is late, it will affect the change of human chorionic gonadotropin, and there may be A low level may occur. If the progesterone value is lower than 30ng/mL, it is recommended to take oral medication for fetal preservation. If the progesterone level is lower than 30ng/mL, it is recommended to take oral medication for fetal preservation. Ultrasound can also be performed at about 45 days of pregnancy to determine the development of the gestational sac, and depending on the situation, continuous fetal preservation treatment can also be performed. If the chorionic gonadotropin is particularly low or if the doubling is not obvious, it indicates the presence of preterm miscarriage and the possibility of ectopic pregnancy, so it should be closely observed.