I wouldn't sweat the 5 lbs. You've got your water weight, your daily fluctuations, and the like. Give it a few more days and see if it continues. I've had my weight fluctuate up to 4 lbs just due to the amount of fluid I take in on a particular day.
Though, if you're 213 lbs, 1500-1700 calories sounds really low -- especially if 600-800 of those are from protein. Depends on how much lean body mass you may already have, but I'd bump that up to 1900-2000 calories. YMMV.
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