I went from a small B to a DD. And mine barely grew at all during pregnancy. I nursed for about two weeks short of two years and its been almost two months since we weaned and they haven't really gone down. I think once we were down to like
twice a day they decreased a little, but I'm probably still a D. I really hate to see what is going to happen with this baby LOL. My advice would be to buy just nursing tanks and sleeping bras since they are less dependent on cup size and just wait
until your milk is regulated to buy real nursing bras. I think I didn't buy any really nice nursing bras until my DD was close to 3 months - I was living in the tanks mostly since breastfeeding makes you hot (at least for the first couple of weeks) and
I was nursing around the clock and the thought of a real bra just sort of made me want to gag :)