Progesterone does not increase at the same value every day. Serum progesterone levels rise steadily with the duration of pregnancy, 30-130nmol/L in early pregnancy, 62-260nmol/L in mid-pregnancy, and 200-700nmol/L in late pregnancy, with some variations due to the individual’s physique and diet, so as long as they are within the normal range it is not relevant. In early pregnancy due to the gestational sac just implanted in the uterus, the development is not very stable, the value of progesterone is low, easy to lead to preterm abortion. Early tests are more frequent and are mainly used to determine whether the gestational sac is well developed. In the early stages of pregnancy, after 6 weeks, the progesterone value needs to be greater than 30, indicating that the development is more stable, too low to use medication as early as possible to maintain the fetus treatment.