I would suggest buying one bra, with a little room to give for the first few days, nursing sports bras work well in the beginning.
Definitely stay away from underwires since the wires can put pressure & cause plugged ducts & mastitis.
I would suggest actual nursing bras, whether they move to the side easily or have hooks, I personally prefer ones with latches as
opposed to hooks, although i forget to "relatch" them again half the time lol.
But, I wouldnt invest much in nursing bras until after the baby comes, some women get MUCH bigger, others not as much. I personally
spent about 4 days in a 38 D, and then went right back to my pre-baby size of 34B/36A, even with Full Time Breastfeeding.
So - get one or two - maybe 1 thats 1 size bigger than you are at the end of PG, and then another 2 sizes bigger than you are at
end of PG (esp if you went up in the # - dont go back to that prepg #! those ribs take a long time to go back down lol).
Then, about a week or two postpartum, once your milk is in, and a little better established, buy another bra or two, and then again
maybe 6 weeks you may find you need yet another size, and thats closer to the size youll use long term
Hope that helps!
Lala...