Newly pregnant, progesterone is below 20, you can continue to observe, review the ultrasound, but also according to the blood HCG value to determine whether the need for birth control. The level of progesterone fluctuates more significantly in early pregnancy, and when tested at different times of the day, the value of progesterone is likely to fluctuate greatly, and it is also necessary to make a comprehensive judgment based on the duration of your pregnancy. Progesterone can be rechecked under a doctor’s supervision, and the development of the embryo can be looked at under ultrasound at the same time. A low progesterone level alone does not clarify the condition of the fetus, and it is also necessary to see whether the pregnant woman has symptoms such as vaginal bleeding and abdominal pain to decide whether she needs to keep the fetus. In addition to the need to test the value of progesterone, blood should also be drawn to test HCG, if the value of HCG doubled every other day to increase well, indicating that the development of the gestational sac is very normal, do not need to be abortive. Pregnant women with low progesterone should pay attention to rest, avoid overworking themselves, and should not do heavy work during pregnancy. During pregnancy, they should undergo regular checkups and seek prompt medical attention if any abnormality is found.