Progesterone is a progesterone hormone secreted by the ovaries of a woman. Progesterone is also present in a woman’s body under normal circumstances, but it rises dramatically after pregnancy as the embryo develops and requires it. The reference range of progesterone value at 10 weeks of pregnancy is 38.0±13.0ng/ml or 118.6±40.6nmol/L. Therefore, it is normal to have a blood test for progesterone if the result is within this reference range. Progesterone plays a very important role in the normal implantation and initial development of the embryo. In early pregnancy, all secretion of progesterone is done by the ovaries, and patients with polycystic ovary syndrome, luteal insufficiency or ovarian insufficiency need to monitor progesterone levels after pregnancy. The placenta itself has the function of secreting progesterone, so a drop in progesterone after the third trimester does not mean that the embryo is not developing well, at this time the supply of nutrients and oxygen to the embryo is mainly done by the placenta, and the development of the fetus will be stable. It is necessary to have a progesterone test in the early stage of pregnancy. If low progesterone is found, you need to take medication to protect the fetus in time, and you can take medication such as Tocopherol, progesterone capsules, Pregnancy Health Oral Liquid and Dextrorphan tablets to protect the fetus. If the progesterone continues to decrease after taking the medication, then it means that the embryo has stopped developing and the fertility treatment is meaningless. However, the final condition of the embryo needs to be clarified by ultrasound to determine whether the embryo is alive, intrauterine pregnancy or ectopic pregnancy, etc.