Having bandage problems.

I got my first look at the incision. It's huge. I re-wrapped it, unfortunately can't reach my vet right now...sunday. I did call the emergency vet but it didn't make sense to go in.
The bandage they applied was supposed to remain until re-check. It slid down until it was riding on the incision and I could see it, I was concerned about the adhesive causing troubles so I cut it off and got it covered with a fresh bandage.