Bra fittings?

Zeba β€’ | m a r r i e d πŸ’β€οΈ 01/29/2013 | n e w y o r k πŸ—½ | πŸ’™πŸ’™ baby z born on 03/07/2016
Before pregnancy I have always been a 34B in my bra size. Up until 2-3 weeks ago I had been wearing the same size but now somehow it seems tighter and everything seems to be coming out of my bra (lol). I dont think the size has drastically changed but im not sure how to find out my new size. Is there any place I can go to get a bra sizing done? Oh and I live in New York if that helps for stores etc :)