Chances of being pregnant?

I was always weary about , but my boyfriend convinced me into it, but we just barely got the head in, and i thought about how stupid it was, and was like, i'm not doing this. he did not inside of me, but I'm unsure if he d before that. I had my period, or what I thought was my period two weeks ago, with cramps and heavy blood flow, so I still think it really was my period unless the bleeding during pregnancy is really that severe. my period after having came about five days early than expected, and then during the days i was supposed to have my period that i already had, there was a brown discharge. today, it's light blood. i think if i was pregnant, i had a miscarriage. i was just wondering what those symptoms may be from.