Don't stress over it. We all face it and there's nothing we can do about it except hold strong to what you've been doing and stay on plan. Don't let the sight of a gain on the scale knock you off plan. Keep drinking water and it'll be done with soon.
"There's no such thing as failure. There's only feedback. Stop judging yourself & start recognizing it for what it is, an entry point for learning. The truth is, if you're not failing then you're not really reaching & really trying. If you don't like the outcome of a situation, learn from it, make corrections & reapproach wiser & stronger until you achieve your goals."