There may still be hope for a drop in HCG after transplantation, but it is not absolute, and the fetus may also be aborted due to fetal arrest. HCG, also known as human chorionic gonadotropin, is a hormone secreted by the chorionic trophoblast cells, which maintains the growth and development of the gestational sac and the fetus, and under normal circumstances after transplantation, HCG doubles well and with a relatively high value, which indicates that the embryo has good vitality. HCG after the transplantation of lower HCG indicates that women are more likely to miscarry, to go to the hospital for gynecological ultrasound, intrauterine gestational sac development is good, accompanied by fetal heartbeat, HCG lower HCG may be luteal insufficiency caused by the doctor’s guidance of fertility preservation treatment, with progesterone soft capsule, dydrogesterone tablets, fetal protection capsule, and other drugs, the use of specific drugs need to be carried out under the guidance of the doctor. Go to the hospital ultrasound after pregnancy shrinkage, no fetal heartbeat, HCG decline indicates that the embryo is not well developed or embryo stops developing, not able to continue to keep the baby, there is no hope. Clinical pregnancy need to do a good job of pregnancy maternity examination, found that there are abnormalities can be dealt with in a timely manner.