If the HCG does not double after pregnancy or the value does not increase satisfactorily, there are several possibilities: firstly, ectopic pregnancy, which is often referred to as ectopic pregnancy, is caused by the abnormal location of the embryo and requires ultrasound examination, at this time the HCG may not increase satisfactorily; secondly, the HCG value in the blood of biochemical pregnancy is elevated, but the ultrasound examination does not diagnose pregnancy or miscarriage. If this is the case, no special treatment is needed for the time being, just continue to monitor the HCG in the blood; third, abnormal embryo development, although the embryo is planted in a normal position, problems may occur during the development of the embryo, or even cause the embryo to stop developing, if this is the case, the increase or growth of the HCG value is no longer ideal.