I cried everyday for 5 days about this. We literally have the same story (and the same surgery date), except you definitely get more Water than I do. Yesterday, I decided to stop fretting about it for at least another couple of weeks and keep doing what I'm doing and see what happens. It's hard to not see a loss after only 1 week (I haven't lost an ounce in 11 days now), but that scale HAS to move sometime....it HAS to. I was eating more and losing faster before surgery so I know this is not all there is to the surgery.
Keep the faith.