What Causes Lower Abdominal Pain And Stomach Sickness After Having Sex?

My bf and I have had sex 2xs and the last time we had sex I was on top of him without a condom for a few seconds and then I started to bleed a little ..a few days after that I started feeling sharp pains in my lower right abdomin and I ve been feeling sick to my stomach as if I had an empty stomach. What does this mean?