If a woman is ovulating and menstruating regularly, the probability of getting pregnant by intercourse three days after menstruation is usually small. If a woman ovulates less regularly, she may become pregnant. For women who ovulate and menstruate regularly, the day of ovulation is usually 14 days before the next period, three days after the period, the follicle is usually not mature, the possibility of ovulation is smaller, and the chance of pregnancy by intercourse at this time is lower. If a woman’s ovulation is not too regular, especially for early menstrual cycle, menstrual period longer women, three days after menstruation may be to the ovulation, this time intercourse, the chances of pregnancy are greater. Therefore, there is a certain chance for a woman to get pregnant if she has intercourse three days after her period, so it is recommended that those who do not have the need to have children choose reliable contraception during intercourse.