I would say you should be okay cause I was on probation and just got off not too long ago and I was in a situation like yours. I was out of town with friends a few days before a test and they blazed in the car the whole time and the hotel room with me in there. I was nervous as hell and I stayed away as much as could but I came up clean still. I would just read things on dilution and stuff to if nothing else help clear your mind and let you relax. Good luck.