The fetal heart may be present 25 days after transplantation. Normally, primitive heart tube pulsations can be seen on an abdominal ultrasound after 6 weeks of pregnancy. With IVF, embryos that have developed to day 3 are usually transferred into the uterus 25 days after transfer, which is equivalent to about 42 days of a normal pregnancy. If the transferred embryo successfully lays in the uterine lining and the embryo is of relatively good quality, a fetal heart may be present at 25 days after transfer. If no heart tube pulsation can be seen on abdominal ultrasound at 25 days after the transfer, a follow-up examination can be performed one week later to determine if there is a fetal heart. After the IVF transfer, you will also have to cooperate with your medical professional to inject progesterone to provide luteal support for the embryo to settle and develop, and to help the formation of the fetal heart and buds. Generally, the progesterone injection can only be reduced or stopped after 10 weeks of the transfer. After the embryo transfer, you should follow the doctor’s instructions to go to the hospital regularly for rechecks. If there has been no fetal heart and buds after the transfer, it may mean that the transfer has failed, or the embryo has been sterilized, and it is recommended to cooperate with the doctor as soon as possible to take appropriate treatment measures.