I'm a C cup & haven't had the chance to wear underwire bra's for 3.5 years now!
I get my maternity bra's from Big W. I like Bonds bra's & singlets the best, but there are some that are moulded into shape that I find ok too. The one I bought while pg with DS is worn out, but I still have it for back up. The moulded cups also make lopsidedness less obvious