don't flush your system u would need to stop smoking constantly stress all that. The thc is stored in your fat glands so your weight and metabolism are gonna affect your results. I always heard beer was the worst thing u could do because it doeesn't reAlly flush your system really just overloads your liver or something. Plus if u flush right before you might fail just cuz your urine is diluted. Combine that with the paranoa of not knowing and u are A nervous wreck.

Go to a headshop get some synthetic urine that has a heat pack and follow instructions. I have personally passed a ua and have a friend who has used it multuiple times for his random uas at work. It's not like your on probation It's just to get a jopb so its a clinic they will ask u to empty pockets and u go into a closed bathroom. Id say order it off the internet but u are on a time constraint. Costs us like 30$ a pop but worth it for the peace of mind and new job...and u dont gotta stop smoking.