is it normal to have your period twice in one month?

I had unprotected sex three days into my period. One day after I had my period, I had unprotected sex again. Two days later I felt like my body was acting weird. So I tried researching early pregnancy symptoms and was told I had to wait at least one week after. Well one week later I started experiencing major cramps like I would normally experience before I start my period. A day later I started bleeding but it wasn't the normal heavy bleeding but it wasn't spotting either. Two days after the heavy cramps the pain severely decreased. Usually when I'm on my period the cramps goes on heavily for days until I take some pain killer, so it's kind of weird that it's like this. I know it's probably too early to tell but could I be pregnant?? It's kind of hard to tell because I haven't really had any symptoms other than what I just said and what makes it weird is that if I am just having my period, is it normal to have your period twice in one month??