UDS positive for alcohol but I don't drink

I'm 33F in pain management for 4 failed back surgeries and 3 right rotator cuff repairs. I take oxycodone, lyrica, pristiq, Xanax, Omeprazole, metoprolol, vitamin d, vitamin c, and collagen peptides. I also was using wegovy samples for a few months.

I've taken 2 urine drug tests the last 2 months at my pain clinic and both have come back positive for EtOH. I have not had a drink in 3+ years. I got discharged from the pain clinic over this. My question is: how is this possible? I've had several drug screens before this that were negative for alcohol and no changes in meds, diet, etc. I am baffled as to how this could happen.

If anyone has ANY insight on this, I'd love to hear it, because I am legitimately concerned. The doctor was not interested in discussing it and just discharged me. Reddit, please help me understand.

Thanks in advance for any help!