HCG, or human chorionic gonadotropin, is important for early pregnancy diagnosis. In early pregnancy, the HCG value increases very rapidly, usually doubling every other day, indicating that the fetus is developing normally in utero. If the test reveals a low HCG value, the degree of low value will have different effects on the chance of keeping the baby. If the low level is small or the doubling is poor, it may be caused by poor endocrine secretion of the pregnant woman or delayed fetal development. If the HCG value does not double or drops more and the HCG level does not increase but gradually decreases, it indicates that the development of embryo or gestational sac is likely to be abnormal and ectopic pregnancy or embryonic abortion may exist. The success rate of pregnancy preservation is generally low, and termination of pregnancy is necessary if necessary. If the HCG value is low in early pregnancy, if the embryo is developing well in the uterine cavity, proper bed rest and medication with human chorionic gonadotropin should be administered as prescribed by the doctor, and the HCG value may increase after one week and the embryo can continue to grow and develop, and monitoring should be strengthened. Surgical termination of pregnancy.