Bra sizes

Hello all! I am 6 weeks pregnant and already grown out of all of my bras!! I am a 36DD. I wasn't wearing any at night but now they are to tender so I am going to try a sports bra tonight. I want to order some comphy bras for sleeping in and then some for everyday use. First question is anyone have any recommendations for brands and second, is there anyway you can predict how big your chest will get?!?! I do not want to spend all of this money on new bras and then grow out of them in a few months! Suggestions? Thanks everyone!