Breast size during second pregnancy?

Regina
Ok, so I am currently at 21w5d. I am already wearing my nursing bras (and filling them up) that I wore two years ago. My breasts increased by a full cup size immediately following the delivery of my first child. They went down some after my daughter weaned herself, but not to my original size. 
If my breasts continue to grow while pregnant, which I'm guessing they will, and then swell up for breastfeeding again, I could be in trouble. Lol. So my question is for mothers who have already had two children, what was your experience with breast size changes?