I am a lurker for now, but will probably be on more once my babies arrive. I'm wondering if I should buy nursing bras based on the size that I am now or wait until after the babies are here and see what size I am. I know your breasts initially become engorged right after birth, but then once you start BFing what size are they...meaning about prebirth size, bigger, smaller etc.
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Re: nursing bra sizing
I'd wait. Generally the 'rule' is you are 1 cup size bigger while nursing. I am about 4 cup sizes above my pre-pg size though even now 11 months into nursing DS.
My advice for what it's worth is to get 1-2 'sleep' style bras (motherhood, target, etc carry these) and/or 1-2 nursing tanks. These are both sized in S/M/L rather than 'cup' sizes, and will hold you over the first couple of weeks until you get fitted for real bras.