The main purpose of progesterone injection is: when pregnant women have symptoms of preterm abortion, inject progesterone injection for fetal preservation treatment, or when menstruation does not come on time, inject progesterone to promote menstruation, after the injection of progesterone injection need to pay attention to: 1, if it is for fetal preservation treatment, after the injection of progesterone injection should pay attention to bed rest as far as possible, prohibit physical labor and sports, do not have sex, pay attention to observe abdominal pain and vaginal bleeding after 3-5 days. 2. If the main purpose of progesterone injection is to promote menstruation, after three injections of progesterone, menstruation will start in about 3-5 days after stopping the drug. During this period of time, patients should pay attention not to eat cold food and not to use cold water to wash face and feet.