Void/refusal of urine drug test

Hello all, hope this is the right place to post this. If not mods please delete.

Student Pilot planning on commercial at majors, 2nd class medical.

to keep this short, I recently completed a breathalyzer + urine drug test as part of the hiring process at a new job. I completed the breathalyzer fine (0.000) however was unable to submit enough of a sample for the urine test, despite the fact I had consumed 5+ liters of water throughout the day. The test was marked as void/refusal to submit. I have never consumed any drugs, alcohol, or other substance my entire life, and am and plan on staying 100% clean my entire life. I have emailed my employer requesting authorization to complete the test again, still waiting to hear back.

My question is, how will this affect my medical and license as well as future career? I am not sure if this test would make its way to the FAA, although the drug test required my SSN so i’m pretty sure it will. I believe I need to talk to an AME? When I do, should I wait until after I complete the drug test again (assuming my employer will allow it) or should I get in contact with one ASAP? As far as I know, the potential consequences would destroy my career, full stop. I am trying not to lose my mind over this. Any resources or potential advice would be greatly appreciated. Not sure where to start.