It is very possible to get pregnant after ejaculating outside the body and then entering the body again. Because before ejaculation there is a large amount of prostate fluid secretion, prostate fluid contains sperm, so in vitro ejaculation before there will be sperm has been left in the vagina. After the ejaculation, the urethra must still have residual semen, and then into the vagina, in the clinic, the chance of pregnancy is particularly high. Especially if you have intercourse at the time of ovulation, the likelihood of pregnancy is very high. It is recommended to take the morning-after pill for contraception, which can be taken orally within 72 hours and may be clinically effective in preventing pregnancy. Some people may experience withdrawal bleeding after taking the pill, which usually clears up in about three days.