If your menstrual cycle is regular, you have your period once a month, and you are pregnant for 40 days, that is, 40 days after menopause, you can check your progesterone. When you are pregnant for 40 days, the level of human chorionic gonadotropin in your body has risen to about 10,000 IU/L, and the value of progesterone at this time will gradually increase, and the hormone level required for the early embryonic growth and development can be satisfied if it is more than 15 ng/ml. If the level of progesterone is low, such as less than 10ng/ml, there will be a pre-eclampsia, need to actively give bed rest and give progesterone drugs for fertility preservation treatment, if it is less than 6ng/ml, most of the spontaneous abortion, the effect of fertility preservation treatment is not good, can only choose to terminate the pregnancy. In the early stages of pregnancy, the level of progesterone is measured to predict the development of the fetus in the uterine cavity.