My guess is that it's water weight...when you eat carbs, you retain more water for/from (forget which) your body metabolizing the carbs (so in reverse, that's one reason why P1 flushes so much water out). I don't think the cheating really did you in (although I'm sort-of a believer in cheating, but that's another story)...a lot of people also retain some water from exercise, which could also account for the pound or so, and since our body weight fluctuates by several pounds throughout the say, it's not much to worry about...
As angelshine mentioned, drink lots of water...drinking more water actually helps get any extra water-weight out....and hey, if you're having a small gain, better to go up in lbs than in inches!
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