Pregnant?

I had unprotected sex on my day 4, still on my period (my period is normally 5 days), although we had normal sex, he didn't finished on me. He finished while we were on anal sex. My fertil widow started on cicle day 9. So today is my cicle day 12 and I've been feeling bloated, I've had like cramps and abdominal pain since day 7. I'm really stressed because my SO told me that if a girl orgasm during sex it is possible to ovulate that same day. He also told me that the first symptoms (first week) of pregnancy are almost undetectable so maybe we are stressing out.

What dou you guys think? could be? it's exaggerated to to think I could get pregnant while on my period and when he didn't finished on me? or I'm totally pregnant?