No, I know.
I think it'd sit under your belly around your hips. If its SPD its because your pelvis is widening too much. The belt/brace is supposed to hold it together & support some of the babies weight I think.
I can't say 100% though as I didn't get to try it.
I think some people have used the belly bands you get off ebay. I'm not sure if they'd help though.

Anyways. Hopefully Sammi's ideas help.
Good luck.