The number of days after the embryo transfer should depend on the specifics of the transferred embryo, and it is usually 3 to 5 days after the transfer. In general, the time to bed after embryo transfer is related to the specifics of the embryo. If the embryo transferred is the 3rd day embryo, i.e. cleavage ball, at this time, the embryo will usually wander in the uterine cavity for a period of time, and it will probably implant on the bed 3~5 days after the transfer, if the embryo transferred is the 5th~7th day embryo, i.e. blastocyst, the embryo is of high maturity, and it will usually implant on the bed 2~3 days after the transfer, and the individual may implant on the bed 1~2 days later. Most people can be asymptomatic after embryo transfer, and some people may have a small amount of vaginal bleeding when the embryo is implanted, which generally does not require special treatment, such as severe abdominal pain and heavy vaginal bleeding should be timely to the hospital. Necessary treatment and examination should be carried out as prescribed by the doctor after embryo transfer.