In early pregnancy, the normal range of progesterone is between 10-20 ng/ml. Since progesterone can promote the growth of the endometrium and maintain the growth and development of the embryo and fetus, once there is a significant decrease in progesterone, it will easily cause the onset of diseases such as preterm miscarriage or miscarriage. As the gestational week grows, the embryo grows and develops, and the placenta forms, which will secrete progesterone during the development and maturation process, causing the progesterone in the pregnant woman’s body to increase as the gestational week grows. For each stage of pregnancy, the progesterone test will have different values, and the doctor can use the test results to help determine the growth and development of the fetus. It is recommended that pregnant women do well in all pregnancy check-ups during pregnancy and keep a calm state of mind to facilitate a smooth pregnancy.