I don't think 0.2 pounds is anything but noise, and I wouldn't worry about it.
0.2 pounds is roughly 3 ounces. That's the weight of less than half a cup of water. I can lose more than 0.2 pounds by taking off my glasses.
If your weight *didn't* fluctuate by 0.2 pounds or more (not just because of water retention, but for no reason at all) I'd be surprised - it's hard to even define the weight of a human being that precisely, when your waste products alone weigh more than that! 0.2 pounds could be water retention. Or, it could be a bite of apple that you ate and haven't pooped out yet! Think about how little 3 ounces really is, and then stop worrying about such small fluctuations.
This is one of the reasons I'm glad to have a scale without a decimal place.