Bra question

I'm only 6 weeks but my regular bras are getting painful to wear. Pre pregnancy I was a 38/40 D. I've seen bra expanders but my band fits fine, I think in another week or two I will be up to a 38/40 DD. Does anyone have recommendations for comfortable bras to buy that allow your boobs to keep growing into it? I'm hesitant to buy my usual bra in the next size because I'm afraid I'll grow out of it in another month or two as it is very supportive but very structured.