It is possible to get pregnant by having intercourse on the third day after your period, only the chances of pregnancy are not particularly high. This is because it is more common for people to have their periods for about 3-5 days or 3-7 days. Some people may ovulate earlier, if the period clears in seven days, the third day of cleanliness is equivalent to the 11th day of menstruation, especially if some people have a short menstrual cycle, there may be ovulation and intercourse at this time may lead to pregnancy. If you have a long menstrual cycle, this is generally less likely. For those who have regular periods, the next period is about 14 days before the next period, which is about the time of ovulation. In general, it depends on whether the menstrual cycle is long or short, and some people may ovulate outside of the period. If you don’t want to get pregnant, you should always use contraception whenever you have intercourse.