The severity of low serum human chorionic gonadotropin in pregnancy needs to be determined by the cause, and is not serious if it is caused by a short period of menopause. If it is caused by ectopic pregnancy or delayed development of the gestational sac, it is a serious case. 1. Shorter menopause: If the patient is in the stage of newly conceived, shorter menopause, lower hormone levels in the body, the patient in the serum human chorionic gonadotropin test will appear low phenomenon, is a normal phenomenon, is not a serious situation. 2. Ectopic pregnancy: Ectopic pregnancy is caused by malformation of the fallopian tube, tubal inflammation and other tubal lesions, patients will experience abdominal pain, menopause and other symptoms, and in serious cases, life-threatening. Ectopic pregnancy can lead to low serum human chorionic gonadotropin, which is a serious situation. 3. Delayed development of the gestational sac: When the development of the gestational sac is delayed, the serum human chorionic gonadotropin will also become low, which is also a serious situation, and may lead to embryonic sterilizations. Patients with low serum human chorionic gonadotropin should seek medical attention when pregnant and follow the doctor’s instructions if necessary.