Will I past my drug test for juvenile probation?

I smoked weed yesterday, getting drug tested in 2 hrs. I kept drinking water to dilute my urine and i ate a lot so i wont burn the THC contaminated fat (or at least i hope). To hide the dilution i just taken 10 500mg vitamin B supplement so my piss will be yellow when i submit my urine. I am a HEAVY smoker,smoke like an Oz a week. Will what i did help me pass the drug test? Is there anything else i should do? I know its stupid to smoke the day before the drug test but I had no idea i had it coming. Sigh... FML.