HCG doubled. Good. Progestin's down. What's going on?

In general, early pregnancy embryos secrete HCG, HCG stimulates ovarian corpus luteum to continuously secrete progesterone, so HCG elevation is generally consistent with progesterone elevation. However, sometimes clinically, HCG elevation and doubling are very good, but progesterone decreases. This situation is generally related to relatively insufficient ovarian corpus luteum function in women, sometimes related to measurement errors or progesterone fluctuations. If blood progesterone decreases to less than 20ng/ml, it is generally recommended to supplement progesterone therapy to prevent abortion. If blood progesterone drops slightly, it is generally not treated above 20ng/ml.