The HCG doubling is normal, but the progesterone is decreasing, which is caused by the insufficient luteal function in the body, the insufficient luteal function will lead to the normal secretion of progesterone, resulting in the decrease of progesterone, which requires timely use of drugs to regulate to ensure the normal development of the fetus, and can be treated with oral dydrogesterone or progesterone. It is necessary to carry out timely conditioning treatment and pay attention to bed rest to avoid miscarriage, and pay attention to less strenuous exercise during taking medication, and it is best not to overload the body and maintain a good state of mind.