Trace amounts of fentanyl found in urine. How tf could this be possible?

Has anyone ever had trace amounts of fentanyl found in their urine sample, withouteven coming into contact with it? I am honestly having a hard time seeing how it could be anything besides foul play. I've been at the same clinic since I got clean in February of '24. I've never had a sorry drop at the clinic because I didn't go to rehab until a couple weeks after I detoxed and my first clean drop was at rehab. I absolutely love the clinic and the doctors and my counselor and the ladies who do the drops and the lady who normally works the front desk. I love everyone there except 1 very lazy person that has always taken issue with me for some unknown reason, but it's always passive aggressive bs. She been frustrated with me for about a month now, complaining to other employees, bc she's been trying to call me to get me scheduled and I have genuinely missed all of her calls. But what she's NOT telling them is that I've been calling her back and she misses the calls. We've essentially been playing phone tag for a month. So I had a missed call from my therapist today saying this woman has been trying to get ahold of me and of course I inform her that I've ALSO been trying to get ahold of her. Then she says "did you drop dirty for fentanyl your last drop? " I said "absolutely not. That's not possible". And my therapist looks at the computer and says "yes you dropped dirty for have amounts. This can happen by simply coming into contact with it so it must have happened with your boyfriend" bc she knows my boyfriend has relapsed for over a year now and that I still see him eveey week. He never even uses around me though. The only thing I can think of is perhaps I came into contact with some money that had it on it? Or my son had an MRI on june2 and he usually gets fentanyl during the procedure. I have to catheter him every 4hrs, so could I have had it on my hand when I touched the cup or something? This seems extremely unlikely to me, as I dropped on the 16th, 2 wells after his procedure. So? Anyone have this happen before? Any ideas on how this could have happened? I can't help but think foul play. I pray I'm wrong, but nothing else makes any sense to me.