If the blood HCG is well doubled but the progesterone is relatively low after the examination, it is mainly caused by the insufficient secretion of progesterone in the body. If the progesterone is low, it often leads to contraction of the smooth muscle of the uterus clinically, which may lead to preterm miscarriage or even inevitable miscarriage. In addition to bed rest and nutrition, it is also recommended to give progesterone intramuscular injection or progesterone pills orally, mainly to supplement progesterone, and only after laboratory tests, if progesterone has reached normal conditions, the medication can be stopped clinically, and regular maternity checks are recommended.