HCG refers to human chorionic gonadotropin, 12 days after transplantation HCG greater than 50IU/L is better, at this time can be initially judged to be pregnant, but the exact value varies from person to person, and is related to the specific situation of the patient. HCG is secreted by placental syncytiotrophoblast cells. After successful transplantation, HCG will be produced in a woman’s body and can be detected by blood draw. It is important to note that the results of one test may be inaccurate, so the test can be done again at an interval of one day. Usually, if HCG is greater than 50IU/L 12 days after the transfer and doubles every other day, it can prove that the transfer is successful and the embryo is in good condition. During the transfer, pay attention to more rest, and at the same time, you should relax, avoid nervousness and anxiety, develop good living habits, and don’t stay up late. Exercise moderately to keep your body healthy. If HCG is found to be significantly lower than the normal level during the pregnancy test 12 days after the transfer and does not multiply every other day, it is recommended to consult a doctor in a timely manner, and under the guidance of the doctor, improve the relevant examinations, clarify the cause of the disease, and provide symptomatic treatment.