I Just Did A Urine Test And It Got Sent

I just did a urine test and it got sent to a lab for further testing...I was taking chantix to quit smoking and I also take Ativan, mirtazipine, wellabrutrin(anxiety meds) testosterone. Would any of these meds cause a false positive? I also 12 days ago smoked one puff of crystal meth. Only one puff though. I was clean for months prior and have not done any illegal drug since...
Thanks for your time...