What are my chances of passing?

Hi, So I got a job offer! Contingent on me passing a urine test, etc. the usual.....

I partook last on the 30th of June. I am not a regular user. Perhaps once per month on average.

Also I might add that over the past few weeks I've been exercising and dieting a lot on the regular.

I'd like to know if you think I'd be good and should wing the test, or should I do a detox cleanse drink, or other method suggested by this site.

Also, do you advise I get a take home test from CVS to check for myself? Are they accurate?

THanks.

btw, I'm a 28 year old male, 5'10" and in decent shape. Not sure if that matters .... [this isn't a dating site]