Here's a little advice about weighing in ... Rick has repeatedly told us that the scale doesn't lie. The key to getting at that truth is to stay consistent, which includes working out (if you're not burning calories, the scale won't have a tale to tell about your tail), weighing-in (always us the same scale, in the same place, at the same time, etc.), and recording your progress (write everything down).
Also remember that the scale isn't stupid. You can't fool it by artificially forcing yourself to sweat during a workout right before a weigh-in. That's not really weight loss. It's not healthy and you'll quickly gain those few ounces right back. Remember your goal is to get healthy and not to just lose weight.
It's not all about the scale. Weigh-ins can be a great encouragement, but it can also drive you crazy. The bottom line is that you know if you've cheated on your nutrition or had a lazy week.