The normal value of progesterone in 8 weeks of pregnancy is between 20.7-36.5ng/ml, if the value of progesterone is low, it will affect the normal development of the embryo or even lead to preterm miscarriage. Progesterone is a kind of progesterone secreted by the ovary, which has a very important influence on normal pregnancy and embryo development. If the progesterone is low, it will easily cause uterine smooth muscle contraction and lead to miscarriage, and after the placenta is formed, it will also secrete a certain amount of progesterone. The causes of low progesterone are related to abnormal ovarian function and abnormal adrenal and thyroid function. When progesterone is too low, it is easy to have vaginal bleeding and abdominal pain, once it occurs, you need to go to the hospital in time to see a doctor, according to the value of the progesterone test and timely supplementation of progesterone and fertility preservation treatment, eat more beans, milk and other foods during pregnancy can help to replenish the progesterone.