I'm 24wks and went from a 16D to a 16E about a month ago, and was told by the lady who fitted me that i can expect to increase in size again. I can't even imagine not wearing an underwire bra, with boobs this big, where's the support? I know I'm going to need a maternity bra, but they just dont sound supportive enough. My sister is always tsk tsk about the underwire. What is the professional opinion on when I should get one and how much damage can wearing my underwire be?