I understand how your feeling, but my problem was just the opposite. I nursed all three of my babies, and when I got done with one, my size went down to my previous size. Now that I'm done nursing completely and not going to have any more kids, my size shrank even smaller! But to answer your question, your size may go down after you start nursing, but not always. You're larger than me, so you might produce more milk all at once. Just don't pump out the extra after your baby is done drinking. It may take a while, but this will program your body to produce a certain amount and no more, due to how much your baby drinks. If your baby starts to want more, than you will have to pump. I am sorry that you are carrying K cups, it sounds like a pain in the back! It is good that you want to nurse you child, but I hope you don't go up in size anymore. I'll pray for you and your new baby.