L.D.
Hi Crystal,
I had a ton of back pain (and also pelvic pain) during my pregnancy, so I started using the Prenatal Cradle (specifically the Mini Cradle though there are a few more elaborate options). I absolutely loved it. They do run small, so if you're on the border of sizes (Amazon has the sizing) I would definitely order up. It was super comfortable to wear, inexpensive, easy to wash, and you couldn't see it under my clothing. I HIGHLY recommend it!
Good luck with your pregnancy,
L.