4 weeks post op, I got 200cc and went from 32A to 32C. Will my size get smaller? (photos)

At 4 weeks postop you are still healing and there may be some swelling. You should have a more accurate size at 3 months postop once swelling subsides and the implants settle more. 

Generally, 150 to 175cc corresponds to one cup size, so I think it is likely you will end up as a B cup, although that is dependent on the manufacturer. I am optimistic from your pictures that as the implants settle, and the swelling resolves you will wind up with a nice natural result.  200 cc is a very modest size implant.