Hip/back pain

Elizabeth • Elizabeth, 26. TTC baby #1 for 5 years now. Two losses, 11.30.11 @ 7 weeks, and 11.28.12 @ 16 weeks.
11DPO, and having TERRIBLE lower back pain that comes around to my hips. My thighs are also sore and the last few days I've been having really crampy legs. Anyone else experience this?