From your description, I'd guess it is round ligament pain.
I have never tried one of the baby shop belly bands. I had a physio one for my twin pregnancy and the difference it made when I had to be on my feet was incredible. You could try a baby shop one - I would guess they would probably be ok - esp in 2nd tri before the baby gets really heavy. Just make sure you tell your dr or middy about the pain too so that you can be sure it is nothing to be concerned about.