There is a chance of pregnancy even if you go to the bathroom to urinate immediately after performing internal ejaculation. Since the sperm enters the vagina, including the cervix, in a split second, even if you go to the bathroom immediately, it does not help to expel the semen completely at that time. If you are ovulating, there is still a 70-80% chance of pregnancy. If you do not intend to conceive, it is recommended that you take oral emergency contraceptives. It is not a contraceptive measure and cannot be used as a regular contraceptive measure, so there may be some errors. So when you have intercourse later, you should take condom contraception as much as possible, which will have a 99% chance of success. It is also possible to have an intrauterine device, or to take certain short-acting oral contraceptives to prevent pregnancy.