Progesterone is needed during pregnancy when progesterone is below 10ng/ml. Progesterone is the progesterone hormone in women’s body. During pregnancy, progesterone facilitates the embryo’s landing, avoids uterine contractions and keeps the uterus in a static state before delivery, and also promotes the development of mammary follicles in preparation for lactation. If the progesterone level is low, it is usually due to insufficient secretion of luteal function, which will have a higher risk of miscarriage. If the patient’s blood HCG is normal, it may be due to transient hormone changes, etc., in which case there is no need for progesterone supplementation. However, if the progesterone level is lower than 10ng/ml and the blood HCG is also reduced, progesterone should be given in time to preserve the fetus. It is important to note that the drug is contraindicated for patients with a history of breast cancer, history of pulmonary embolism, liver dysfunction or disease. There may be adverse reactions such as headache, dizziness, gastrointestinal reactions after progesterone shots. The medication should be used under the supervision of a doctor to avoid unauthorized use of the drug to avoid adverse reactions.