Weigh in.
The first time I did WW I would avoid weigh-ins and say, oh, I'll just do better next week - then next week would come, and I'd say the same thing, so on and so forth.
So my advice to you is weigh in - if you had a bad week, it'll be kind of a kick in the pants to get you back on track. I would always make excuses to myself oh, I didn't gain THAT much, it'll be fine - but I'd never know.
If you know, then that's a different story.
Who knows, it may be better than you think