What Bra Size are you?

I started at a small C and am up to DD already at 19.5 weeks. Everyone keeps warning me that the tities are only going to get bigger and to wait until I breastfeed they will by HUGE! I'm pretty small only 5feet and started at 108 lbs at the start of my pregnancy and all my girlfiends can't stop remarking on how huge my chest is. Just wondering how much others chest have grown?