A progesterone level of 26ng/dl or higher on day 35 of pregnancy is considered normal. If the measured value is lower than its value, it means that the progesterone level is reduced, which may lead to the occurrence of preterm abortion. Progesterone is an important hormone to maintain normal pregnancy, mainly to reduce the body’s rejection and maintain the endometrial secretion period-like state, progesterone is reduced mainly due to luteal insufficiency, need to be timely additional supplementation to prevent the occurrence of accidents, but also need to pay attention to observe whether there is abdominal pain and vaginal bleeding. The 35 days of pregnancy is the early stage of pregnancy, need to pay special attention, pay attention to more rest, avoid strenuous exercise, after the pregnancy test, need to carry out ultrasound examination, mainly to exclude the possibility of ectopic pregnancy. Pay attention to strengthen the nutritional intake to avoid malnutrition, which may affect the development of the fetus.