There may be no symptoms when progesterone is low in early pregnancy, or symptoms of pre-miscarriage such as lower abdominal pain and vaginal bleeding. Progesterone is mainly secreted by the ovarian corpus luteum at the beginning of pregnancy, when the corpus luteum is not functioning properly, it can cause low progesterone. When the progesterone is a little low, there may not be any symptom, but there may be pain in the lower abdomen, vaginal bleeding and other symptoms of miscarriage, and it is necessary to pay attention to the doctor’s instructions to take a rest, and to give the progesterone and other medications to protect the fetus treatment. In the early stages of pregnancy, as the development of the embryo is still unstable, it is necessary to pay attention to appropriate rest, avoid exertion and strenuous exercise, prohibit coitus, continue to follow the doctor’s advice to take folic acid on time, when there are symptoms of preeclampsia, such as vaginal bleeding, abdominal pain, it is necessary to comply with the doctor’s advice to carry out ultrasonography, blood HCG (human chorionic gonadotropin) levels to assist in the diagnosis. Low progesterone in early pregnancy increases the risk of early miscarriage and needs to be actively treated under medical supervision.