Time for a nursing/pregnancy bra!?

Brittany • ♡ 1st Time Momma!! ♡
Currently 6 weeks today and a first time mom (Yay!!). I'm naturally a 34DD but in the last two to three months I've become a 32DDD. Since finding out I'm pregnant I've gotten bigger and very sore. I really want to buy a nursing/pregnancy bra but unsure if I should wait it out or not since I'll unfortunately get bigger. My 34DD bras are becoming much, much tighter. What do you say ladies? And what's a good nursing/pregnancy bra to purchase? Thank you!