Progesterone injections for fetal preservation generally has no time limit, need to be based on the fetal situation to decide, early pregnancy usually take about one week to two weeks, such as review ultrasound embryonic development of abnormalities, need to consider stopping fetal preservation, termination of pregnancy. Progesterone belongs to the progesterone class of drugs, patients with preeclampsia to meet the criteria for fetal preservation, can follow the doctor’s instructions for injection of this drug for fetal preservation, usually about a week of progesterone to play a role in the related clinical symptoms, such as bleeding, pain, and so on can be gradual, and so on, until the placenta establishes the function of their own secretion of progesterone, you can consider stopping the use of progesterone. Some pregnant women who have recurrent bleeding during pregnancy may need to use it for a longer period of time. It should be noted that prolonged use of progesterone can lead to an increased risk of localized hardening and may also cause local reactions such as sterile abscesses. This medication is to be used under the treatment of a doctor, and the dose and duration of treatment are strictly prescribed by the doctor.