Progesterone less than 18ng/ml at 6 weeks can be combined with the ultrasound results, if the results suggest that the embryo is well developed, medication can be given to protect the fetus as prescribed by the doctor. Serum progesterone can rise gradually with the increase of gestational weeks, which is conducive to the fertilization of the egg and prevent uterine contraction. The normal value of progesterone is 20~25ng/ml at 6 weeks of pregnancy, when the value of progesterone is 18ng/ml, it suggests that the value is on the low side, which needs to be combined with the ultrasound results, suggesting that the embryo is well developed, it can be given to the doctor’s instructions such as progesterone and other medications for the preservation of the fetus treatment, and repeat the checkups on a regular basis. If the symptoms of preeclampsia, such as abdominal pain and vaginal bleeding, improve or disappear after proper rest and active medication for fertility preservation, and the ultrasound examination indicates that the embryo is well developed, the pregnancy can continue. When the abdominal pain worsens or the vaginal bleeding increases, and the progesterone does not rise obviously or decreases, it mostly suggests that miscarriage is unavoidable and the pregnancy needs to be terminated in time. When the progesterone is lower than 18ng/ml for 6 weeks, it needs to be actively treated under the guidance of the doctor, and be rechecked on time.