Charming topic I know.

Well, I'm having an issue and my baby brain can't figure out what to do

My boobies have grown from a 10AA to a 12/14D (really not sure if thats a woohoo or a boohoo but anyway!) and now I'm having a problem with under my lovely large milk bar lol!

If I don't wear a bra I end up with sweat pimples under my boobs, which is ouchie.
If I do wear a bra I end up with a rash, which is a lot like the sweat pimples only red and sore as well, which is also ouchie.

What do I do? I've never had this problem before (never really had boobs to have problems with lol!). Is there something I can do to stop that? All my bras are clean, and I wash under there, and I can't work out why it keeps happening Is my bra possibly too tight? At the moment I am wearing a 12D, but really do need to 'upgrade' to a 14D... could that be the problem?

Haven't gone to see the dr about it (bit embarrassing!), I have a midwife appointment on Thursday but wasn't sure if its just one of those things (as mostly everything seems to be ).

Anyway, now you all know my lovely secret, have a great day!