Outgrew all my bras 😩

This might sound like a dumb question, but I’m a first time mom so this is all new to me. I’ve recently outgrown all my bras and my boobs spill out of C cups, it’s honestly so uncomfortable. I was thinking of buying a few D cups (without underwire bc my Victoria’s Secret bras have been killing me with the underwire) but wasn’t sure if I should just buy a couple to suffice during my pregnancy or if I should actually start wearing D cups from now on? Will my boobs shrink a little post birth? TIA