I was the same hun, for a week I literally cried when mine shrank, as I never read on here about it happening, I was devastated completely. Going from an a to dd, the shrinking to a d being big is awful, but they grow back, I’m back in the dd, and can’t fit in the d without a squeeze, but they will grow, honestly. It’s just your surgery swelling going, give it a week and you will see the creep back up. I’m almost six weeks post op now, and I still have a way to go xx