Haha, I don't think that's considered cheating. It's your tracker, and you can choose to use it as you like. If that means using it to record your lowest weigh-in, then go for it. It would be a bit obsessive to update your tracker *every* day, since you already know how much your weight can fluctuate on a day-to-day basis... :)
my nephew was at my dad's and saw the scale when he used the bathroom. He weighed himself, got on the treadmill for 5 minutes or so, then weighed himself again and said, "I didn't lose a single pound!"
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