Ejaculation the night before can also lead to pregnancy if you have unprotected sex the next day. Ejaculation is a normal physiological phenomenon and does not usually affect the quality of sperm during sex the next day. Therefore, as long as there is no contraception, there is a possibility of pregnancy. In addition, it also depends on whether the sexual intercourse is at the time of female ovulation and whether the woman has a mature egg to discharge. If you want to successfully get pregnant, it is best to have sex during the woman’s ovulation period, so that the chances of conception will be greater; if there is no need to prepare for pregnancy, no matter whether it is in the ovulation period or not, you should actively take scientific contraceptive measures to avoid unwanted pregnancy.