postpartum cramps?

So I got my period back when I was 5 months pp. my cramps are never that bad and my period usually wasn't lasting too long. Well this last period I had on the 21 lasted 7 days which is not the norm for me. For past couple days it almost feels like I'm getting period cramps or it might be gas cramps. It's just a dull cramp that won't go away. My period isn't due for awhile? I'm hoping this is just gas or I'm ovulating? I can't be pregnant..hubby and I use condoms and haven't had sex in a little while cuz he's away for training