HCG is human chorionic gonadotropin, and if there is a doubling of HCG and a decrease in progesterone, it may be normal, or it may be caused by luteal insufficiency, for example. Progesterone is secreted in pulses and fluctuates greatly in early pregnancy, so it may only decrease temporarily. At this time, if the pregnant woman does not have abdominal pain, abdominal distension, vaginal bleeding and other symptoms of preeclampsia, and the serum HCG is normal, you can first observe, follow the doctor’s instructions to review, without special treatment. If the progesterone drops in several checks, it may be luteal insufficiency. It may be that the corpus luteum is not fully formed after ovulation, resulting in insufficient progesterone secretion. It affects the conversion of the endometrium, which is not conducive to the implantation of the fertilized egg. Progesterone capsules can be used as prescribed by the doctor. If abnormal progesterone occurs, it is recommended to consult a doctor in time, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the cause of the disease, targeted treatment or treatment.