Bra size expectations

Kristi
Pre pregnancy: 34 B 24 weeks: 36 D
I could probably wear a 38 depending on the style. My question is....have I done most of my growing or do the grow most/more in the 3rd trimester? I'm trying to only buy one or two bras each time I have to size up. This time I went ahead and got nursing bras in hopes that they can be used for longer.