I've had my IUD in for like 4 months now. I bled a ton for 7 weeks straight, but since that it's been good to go.
Yesterday I started getting some bad cramps, but they're more in my lower back than in my abdomen. They're not contraction-like, it's more like a constant ache, or a painful pressure, in my lower back/pelvis.
I'm going to call my OB tomorrow if they don't go away, but I was wondering if anyone else has experienced this. 
                 
                
Re: IUD people...anyone else have really bad cramps?