If you have had your period after intercourse and the color, volume and duration of your period are the same as before, you will not be pregnant, but you should pay attention to the following points: 1. If you have had your period but the volume is low, you should rule out the possibility of pregnancy and use early pregnancy test strips. 2. If your period is dripping and longer than before, you should also rule out the possibility of pregnancy. If your period is regular, you can use a safe period contraception, the chance of pregnancy is less. If the period is irregular, the use of safe period contraception is often unsafe, it is best to use condoms throughout the process of intercourse, will achieve a very good contraceptive effect.