My rib cage expanded with the pregnancy, meaning I went from a band size 36 to a band size 38, and that didn't change. But although my cup size expanded a lot during pregnancy (well before I did any nursing), my breasts came back down to about the same cup size after I was done, maybe a half of a cup bigger. I think part of that was because I did breastfeed, everything just popped back to normal (except the expanded rib cage) when the nursing time period was over. Don't let worries about your breasts hold you back.
Thanks for your positive words. I'm just more worried about having big breasts again, the pain in my lower back and shoulders. I just want to feel confident afterwards.