Low progesterone on the 50th day of pregnancy requires supplemental progesterone therapy if accompanied by symptoms of preeclampsia. Progesterone is an important hormone that maintains pregnancy, and a serum progesterone level greater than 20ng/ml after pregnancy is generally normal. For 50 days pregnant check progesterone low, and accompanied by abdominal pain, vaginal bleeding and other symptoms, need to follow the doctor’s advice to pay attention to rest, reduce activities, prohibit coitus, and give progesterone, dydrogesterone and other drugs to protect the fetus treatment. After treatment, the progesterone value is normal, the symptoms improve, and the ultrasound indicates that the embryo is well developed, the pregnancy can continue. For those whose progesterone value is still low after treatment, whose symptoms do not improve or worsen, and whose ultrasound suggests that the embryo is not well developed, the pregnancy needs to be terminated. Therefore, if you have low progesterone on the 50th day of pregnancy, you should take active symptomatic treatment under the guidance of your doctor and repeat the examination on time.