Progesterone shots for birth control should not be stopped at once, and sudden stopping of the medication may lead to miscarriage. If the pregnant woman herself has poor ovarian and corpus luteum function, it will lead to insufficient secretion of progesterone during pregnancy and easy to miscarry. Progesterone is a natural progesterone, when the secretion of progesterone is insufficient, it can be injected intramuscularly to achieve the effect of supplemental progesterone, which can stabilize the fetus and prevent miscarriage. Generally, by the third trimester, when the placenta is formed and the condition of the fetus is stable, the dosage of progesterone can be gradually reduced. However, during the period of taking progesterone to protect the fetus, it should not be stopped suddenly. If the drug is stopped immediately, it will cause the progesterone in the pregnant woman’s body to drop suddenly, increasing the possibility of miscarriage. Therefore, during the period of taking progesterone to protect the fetus, it is necessary to strictly follow the doctor’s instructions, not blindly stop the drug, after the fetal condition is stable, you can gradually reduce the dosage to stop the drug under the guidance of the doctor.