Relax.
If you dont do drugs youre all good. If you doo you are screwed. If you cant pee they'll let you sit tiill u can.
Take a large coke wiith you. Dont pee that morning.
It's allll auto for me and ii once peed without even thinking about it just before i took off for a drug test.
Ive come close to flushing during the test.. etc etc....
Just focus and dont stress theyre not out to get you i promise