i got this too, v sore ribs when i sat down for long time in certain bras (this was early on)... I found a swap of bras to maternity bras helped a lot - get a good fitting donw. I havent grown much (1 cup size so far) but the chg in design helped me a lot - even now I know diff bras give me more or less pain...
Also an underwire will def hurt you more (and I think they are not recommended in preg anyway).
Good luck with your preg!
I started having difficulty with my normal bras from about 9 weeks (they all had underwires).
I bought the new Bonds maternity bras - they are extremely comfortable and have a good length of hooks at the back (double normal bras) so you can make it the right comfort level for you.
Not sure if this will still be too tight for you, but I have found them to be great.
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