A 3 day old embryo cannot be transferred with a blastocyst. Generally, patients will only be recommended to transfer two fresh embryos or one blastocyst to avoid multiple pregnancies which will affect the woman’s late pregnancy and the growth and development of the fetus, and in the embryo culture, fresh embryos and blastocysts can’t reach the same number of days, one is the embryo on the third day of culture, and the other is the blastocysts cultivated up to the fifth day, which can’t be transferred at the same time. Before the transfer, both men and women need to pay attention to rest, do not smoke, do not drink, stay away from radiation; after the transfer, you should take medication on time, you need to use progesterone for luteal support after the transfer, appropriate activities, you need to keep your mood happy, avoid the influence of tension, anxiety, depression and other bad emotions, and go to the hospital to do a blood test to determine whether you are pregnant or not in about two weeks after the transfer.