Not being able to detect pregnancy on the eighth day of blastocyst transfer does not necessarily mean that it is a failure, it is recommended that you can check two weeks after the blastocyst transfer operation, if there is no pregnancy in two weeks after the operation, it means that the operation is a failure, and if the pregnancy is detected two weeks after the transplantation, it means that the transplantation is successful. The peak time of blastocyst implantation after blastocyst transfer is seven to fifteen days after the transfer, if you can’t detect pregnancy eight days after the blastocyst transfer, it may be due to the late implantation of blastocysts, which doesn’t necessarily mean that the blastocyst transfer has failed. It is recommended to have a blood test for human chorionic gonadotropin two weeks after the blastocyst transfer. If the blood test for HCHG two weeks after the blastocyst transfer does not show pregnancy, the procedure has failed. If the blood human chorionic gonadotropin test is performed two weeks after blastocyst transfer and pregnancy is clearly detected, the procedure is successful. Therefore, failure to detect pregnancy on the eighth day after blastocyst transfer does not indicate failure of blastocyst transfer, and it is recommended to wait for another week before going to the hospital to check the blood human chorionic gonadotropin level.