hey man,
been in this position before myself, and I have a drug test coming up on the 12th of may that I need to pass for a job, too. I was expecting it so I quit smoking April 8th and am still pretty nervous about failing so I have been exercising and pounding things with antioxidents such as green tea and cranberry juice. also drink a shit ton of water and try to work up a heavy sweat at least once a day.
if you want to do this the hard and risky way, take a small bottle (I used an empty 4 oz cough syrup bottle) and fill it with a buddy's piss. Make sure it is fucking clean! sparkling clean! I know this is nasty, but it works. During pre employment tests the administrator never watches you actually piss. For mine, they literally shut the door and left me in there, so I just took out my medicine bottle and poured it into the cup, then capped it up, shoved it back down my pants and baboom! 3 days later I had a really sweet job and got to keep on smokin on. The heat from you nuts will keep it at about 94 degrees so the temperature is not a problem, just make sure it is directly on your skin.
Also, make sure this is a trusted friend who doesn't use any of the 5 drugs that pre employment tests scan for: THC, amphetamines (this includes adderall and those types of "study" drugs, make sure they haven't used these in the past 4 days because you will test positive for meth and lose your job if you do not have a prescription for this), cocaine, pcp, and opiates (make sure they aren't taking any pain killers either).
Anyway, from your situation you sound like you'll be alright. buy an at home drug test and see how you test. Good luck brother!