It is still possible to get pregnant if you wash off the semen immediately after it is ejaculated. Because there is no way to wash off semen after it is ingested into the vagina, as long as a small amount of sperm survives in the vagina, the possibility of pregnancy exists. There are a lot of folds in the female vagina, after the semen enters the vagina, it can be attached to the folds and exist, or it can enter the uterine cavity in a short time, reach the fallopian tube and combine with the egg successfully, thus causing pregnancy, so it is not desirable to try to prevent pregnancy by washing after ejaculation.