Im sure you will pass. I just got drug tested 3 days ago and found out i passed. I was really shocked. I smoked for 2months straight if not longer everyday and then stopped for 12 days and passed my test. All i did was drink water everyday but not a whole lot maybe like 5 glasses a day. I really did'nt think i would pass. Im just under 6 feet im like 5' 11 and i weigh the same you do im at like 135-140. You should'nt worry. Even though im positive you should be good just make sure you use the bathroom once before the test.