Another Drug Test Question

Alright everyone here is my story: Started smoking in about april 2009 maybe smoking about once a week. I stopped may 8th and i didnt do it until may 29 and may 30th. On the 29th i shared a joint and took 2 bong hits on the 30th i shared bowl, the me and like 4 friends hot boxed like 3 joints passing them around, and then i took like 2 hits from a bong. I took a home drug test kit on the 28th and it was negative.
The reason im asking now was orginally i was suppose 2 get a job with my dads auto company and they require a drug test (hes a manager). Then they scanned my backround found i had a accident and a speeding ticket on my record and said i couldnt be hired. So i did what i stated above. Now my dad comes 2 me and says he talked to the dm and he can hire me now. But i smoked 29th and the 30th and i need 2 take a drug test if i want the job. Do you think ill pass? Im 18 almost 19 about 5,10 250lbs any advice would be great thanks so much