The vast majority of people will expel the fetus within about six hours after taking prostate, and a very small percentage of people may not have the embryo out until the next day. The situation of each person is different, because of the individual differences, each person’s absorption and excretion of the drug is also different, plus the development of the embryo also varies in size. If the embryo is relatively small, it may take a shorter time, about 1-2 hours, for the embryo to flow down. If the embryo is bigger, it may take longer, maybe 4-5 hours. The prostacyclin can cause strong contractions of the pregnant uterus, and with the help of mifepristone, the embryo can be removed from the uterine cavity.