C.B.
A friend of mine actually designed one that works as a support band for maternity in general and runners who are pregnant. I don't run, but I was one of her test subjects for wearing it and it was fabulous! It's adjustable so it can fit any size, is breathable so you don't get all sweaty and it works as postnatally too!
http://www.mombodfitness.com/fitsplint-maternity.html