Progesterone is between 25 and 30 ng/ml on the 40th day of pregnancy, but values can vary slightly due to different testing methods and testing times. Progesterone is secreted in pulses during early pregnancy and the level fluctuates greatly. The level of progesterone in a single blood test does not indicate whether the corpus luteum is functioning well or badly. If progesterone is found to be low, it should be combined with blood HCG and ultrasound to determine the development of the embryo, and at the same time, it should be seen whether there are symptoms such as abdominal pain or vaginal bleeding. If the diagnosis of low progesterone caused by preeclampsia is confirmed, accompanied by abdominal pain and bleeding symptoms, you can follow the doctor’s instructions to use progesterone, dydrogesterone and other medications to protect the fetus, and at the same time, pay attention to rest.