^Exactly what Melbelle said. You will get through this- and aren't the cutoffs meant to give a higher false positive rate with the 1-hour?
You sound like you have things under control for diet/exercise, so *if* it comes out positive, you will be far ahead of the game.
Good luck with the three hour!
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The ultimate measure of a man is not where he stands in moments of comfort but where he stands at times of challenge and controversy - MLKJ