Absolutly worried! I'm a 32D, even after having had a breast reduction 10 years ago. My sister was a C or so before pregnancy and after she had her first all I could think of was how freaking ginormous her boobs had gotten, they literally took over her frame. I'm more petite than her (though with larger non pregnancy boobs!) and I don't know what mine are going to do, but they are already aching and growing. I'm going to be one giant boob if they end up growing as much as hers did...
This.. I am a 32GG pre-pregnancy, and I'm already spilling out of every bra I own. I have been considering a reduction for years, but decided to wait until after I have kids. My sister, who had lovely perky DD's when she got pregnant ended up with borderline cartoonishly large boobs, and even with breastfeeding, they never went away. I remember a photo of her she sent me breastfeeding... her breast was almost as large as the entire baby. And that was on a 5'2" frame..
I am terrified. I just ordered some wireless ones from Bare Necessities.com that are great for lounging/sleeping in, but I do not know when or where I will be finding anything supportive anytime soon in my "enhanced" size. Nothing like the feeling of your boobs resting on your upper abdomen to make you feel sexy. >:/