My period isn't due for 5 days but I've been having dull cramps for a little while after each time we have sex. Only been happening in the last week. It's not from orgasm either because I didn't finish (phone rang and I told him just to finish quick because the phone call was my mom saying she's on her way over..lol). It wasn't rough or deep either. I can feel it a little in my lower back as well.