Why am I feeling like this?

So I ended my period on 10/13 and this period I had virtually no cramps which is very unusual for me. I was bleeding normal for the first 2 days and was pretty much done by the 3rd. I mean it was awesome but it's just out of the norm for me. Ever since I've stopped I've had slight cramping and my boobs still hurt which isn't normal either. The only thing different was that my SO didn't pull out twice in my fw and once before my period. I don't think I'm pregnant because how? I just feel weird and I wanted to talk about it. Feel free to give some input.