Progesterone is also present in women who are not pregnant. Since the value of progesterone varies from one menstrual cycle to another in women, it will be roughly less than 3.1 nanograms per milliliter during the non-pregnant period. However, the normal value of progesterone in each person’s body varies very much, considering that each person has a different body type and physical condition. Before a woman becomes pregnant, when progesterone reaches its peak value, it can be 0.5-20 nanograms per milliliter. By the time a woman successfully conceives, in early pregnancy, the progesterone in her body may reach 5-10 ng/ml and at most not exceed 20 ng/ml. If a woman has low progesterone, the fetus will be very unstable and highly susceptible to preterm abortion in the first trimester. Therefore, women with low progesterone can eat dietary fiber-rich foods such as peaches, strawberries, and kiwi and grapefruit.