The chances of getting pregnant during intercourse one day after the end of the period are low, with a 5%-10% chance of occurrence, because this is not the time of ovulation and the endometrium is thin, which is not conducive to the fertilization of the egg, so the chances of pregnancy are low. Except for some women who ovulate early, 3 days after their period, the chance of conception increases to 40%. Because the sperm remains in the vagina for 72 hours, just 3 days after the end of menstruation, which is the period of ovulation, and if it unites with the egg, it can cause the chance of conception, so it is necessary to take the oral emergency contraceptive pill during the safe period to play a contraceptive effect. It is advisable to take condoms for contraception in any period of time in the future to avoid unplanned pregnancies and the need to terminate the pregnancy, which can have an impact on the body.