I'm in the same boat, went from a 12 G to a 14H by about the time I was 6-8 weeks and haven't changed since. I've got a triumph bra, very UN-sexy but suprisingly supportive and comfortable

I'm also going to try the Hot Milk brand, they seem to have larger sizes that are very pretty. I tried on a 14G in one style and it was huge on me, their new season stuff has just been released.