Under normal circumstances, HCG doubles every 48 hours in early pregnancy and progesterone usually remains at a relatively high level, which should be above 25ng/ml under normal circumstances, which is a sign of good ovarian corpus luteum function. The doubling of HCG is not particularly obvious in some people in the early stage, possibly because of bad embryo, plus if the progesterone is low, ultrasound to determine the premise of intrauterine pregnancy can choose fertility preservation treatment. As long as the HCG doubling is normal and progesterone is high, most people will have fetal heart and fetal buds when they are 50 days or two months pregnant, which means the early embryo development is normal. If the HCG does not rise, or even fall, even if the progesterone is high, it means that the fetus is underdeveloped, or even that the fetus has stopped developing. If the HCG drops, it means 100% that the embryo is not good, and only termination of pregnancy can be recommended.