Mine have got huge!! Im 28w+1 now but at the begining of the preg i didnt even know i was pregnant so there was no change (i found out at 19w)
I'm 32 weeks on Monday and my boobs haven't grown at all...they're still the same size as they were pre-pregnancy :) I was told it was nothing to worry about, and they'll grow when my milk comes in :)
Mine didn't get bigger until my milk came in with my first but with this one they've grown about a cup size so far every pregnancy is different I wouldn't worry
Small breast have no impact on milk production. Letting the baby suck for as long as it wants does. Also for best breastfeeding results let the baby feed on one side per feeding. You avoid becoming lop sided and the baby gains weight faster.
Your milk won't come in 2-4 days after you deliver, so don't worry!