After frozen embryo transfer, you can usually use an early pregnancy test around 10 to 14 days. Embryo transfer is to move the embryo developed in vitro into the female uterus, after entering the uterus on the 1st to 5th day, the embryo touches the inner wall of the uterus to invade the uterine lining, implantation, the embryonic trophoblast cells begin to secrete a trace amount of human chorionic gonadotropin (HCG), which can be detected in the mother’s serum about 10 days after implantation. Clinically, HCG is usually measured in the mother’s blood 14 days after embryo transfer, or in the woman’s urine using the early and early pregnancy test. If the HCG level is elevated, a round or oval-shaped gestational sac can be seen in the uterine cavity when ultrasound is performed 35 days after the transfer, and a clinical pregnancy can be diagnosed at this time. After successful embryo transfer, it is necessary to follow the doctor’s instructions to go to the hospital for a definitive diagnosis.