How much weight do I need to lose to decrease at least one cup size after Breast Augmentation with 425cc/500cc HP Implants?

I recently had a BA and I am very uncomfortable with my size now. I feel they are too big for my body, I am 4'11, 140lbs, I went from a B cup to a DD, my implants were high profile, 425 on my left because it was the bigger breast and 500 cc on my right, which was a smaller breast. I wish I had the $ to go back and have them re-done with smaller implants, but I don't. The only thing I can think of to do now is lose at least 20 lbs, which I need to do anyway and hoping this helps to bring down the cup size.