Progesterone at four weeks is generally best around 20ng/ml. During pregnancy, HCG and progesterone are two important indicators to maintain pregnancy, only when both indicators are ideal pregnancy can be maintained, generally the ideal value of HCG before 8 weeks of pregnancy is doubled every day or two, such indicators suggest that the embryo is developing better, but progesterone generally does not change much with the week of pregnancy, it may fluctuate around 2 units, so the best progesterone is at 20 units. If it is around 10 or 15, and if it is determined that the pregnancy is intrauterine, the clinic will usually give intramuscular progesterone or oral progesterone capsules, and then review it after a week, or give oral dydrogesterone tablets, one tablet once a day, and dydrogesterone tablets can usually be taken orally until about 5 months of pregnancy, which is a relatively small dose, usually 10 mg a tablet. In addition, if the progesterone is particularly low, less than 15ng/ml be alert to the possibility of ectopic pregnancy, and if the progesterone is less than 5ng/ml, it generally suggests that the embryo has stopped developing. In short, it is better to have progesterone between 15ng/ml and 20ng/ml for four weeks, if it is too low it is recommended to supplement progesterone to prevent the possibility of embryonic arrest. It is also important for pregnant women to relax and have a good attitude towards pregnancy.