Will I pass?

I hate to be like everyone else in asking will I pass. I know it's not definitive, but I need some other experiences to go on.

I'm a young male. Height 5'10", weight 126lbs. I have a fast metabolism. I have abstained from smoking for what will have been approximately two weeks at the time I will take the drug test. I had been using around 3 times a week give or take for about 4 months. I was smoking nothing above middies, and at that not much per use due to a low tolerance.

Will I be able to pass? If I probably won't, I still have 3 days before my test, so is there anything I can do to help get clean in time?