Is Tetracycline traceable in your blood? I take 500mg, 3x a day...?

I am 19 years old, 185lbs, and 6 foot 3 inches. I am taking 500mg 3x a day for acne on my chest and back for the next week. But I am going to go into MEPS for the military next week and can't be on any medicine or I will be disqualified. So if I keep taking it up until the night I leave will they be able to trace it in my blood or urine? If so, how long before hand should I stop taking it? Thanks and 10 points best answer!