It is possible to get pregnant if you have intercourse just 3 days after your period, but the chances are low. Generally speaking, women can only get pregnant if they have intercourse when they are ovulating. And the time of a woman’s ovulation is usually about 14 days before the next menstrual period, and the chances of pregnancy are higher if you have intercourse within a few days before and after this date. And in addition to ovulation other time period, because the possibility of pregnancy is lower, in the menstrual period just gone 3 days, menstrual regular women ovulation is less likely, but there may be ovulation, so coitus will have the possibility of pregnancy, just the possibility is lower. If a woman’s menstrual period is not allowed, then it means that the woman’s time of ovulation is not fixed, which will lead to a greater chance of pregnancy when the menstrual period has just gone 3 days. An early pregnancy test can be done about 10 days after intercourse to determine if you are pregnant or not.