I tried running with a carriwell bump support band but it just seems to squash my bladder, have the same problem when folding down leggings so they sat under the bump. Also my tops and leggings began to gape apart which given the temperature right now is not ideal. I failed to find any maternity sportswear designed for actually running in so in the end I bought a pair of unpadded bib tights which are designed for cycling but streach quite nicely over the bump. I've been wearing those with a base layer underneath and a larger sized wicking tee over the top. I did find that you can get a running skirt with integrated shorts and a bump band (http://www.maternityrunningskirts.com/) and they do some properly fitted wicking tops so I'm planning on ordering from there once it warms up a bit.