Baby cino n New Market has a maternity section you could check out - they're on carlton gore road. Bonus is that they have some gorgeous but way spendy baby things too. Also nature baby is about 100m down the road and has some very cute (and well wearing/washing) baby clothes.
Is this your first pregnancy - I was due about the same and my best purchase were some maxi tops and dresses from Glassons, a lot cheeper than maternity clothing and better looking in most cases! I wore them until I was due and I got huge!
eta: check out
ASOS, their an online store based in England, but they have lovely stuff and free shipping, do maybe something to tempt you there
Edited by Puddleduck