I have a few quiestions about women menstrual cycles and need advice? not sure if i am pregnant or is it my period? blood after sex.

Need to get examined: There are many reasons why women may bleed with intercourse. Some common causes include: a small tear or trauma, a cervical or uterine polyp, or an infection, including a sexually transmitted infection. A home pregnancy test would be useful in this situation as well. It is really only possible to help you if you get examined and tested.