Hi hun I’m 30 back size and now 2 days post op wearing 32 back size sports bra! I was expecting to be a DD post op, but I bought a few size (1 front zip shock absorber 32DD, and shock absorber run sports bra size 32DD,32E and 34DD)for fitting to be sure. Now I’m keeping both the 32DD sports bras for changing. Hope this help! x x