I came up positive for amphetamine, was I wrongfully discharged?

I was seeing a pain management dr and she was prescribing me percocet. I told the dr I wasn’t taking it bc I was extremely ill and taking dayquil/nyquil, zpak and my inhaler occasionally. They discharged me bc they said I should have came up positive for amphetamine. I argued with with them for 30 minutes saying amphetamine and acetaminophen are 2 completely different thing but she kept arguing with me that they were the same. I think i know the difference between the 2 bc i work in the health care field. So does this mean I was wrongfully discharged?