Please calm my nerves

Took a pre employment urine drug test yesterday evening. The last time I smoked was early/mid-October so it’s been about 3.5 months. I’m 5’11” and about 215-225 lbs, always drinking water and occasionally cranberry juice. I was basically an hourly smoker for something like 8-10 years, usually pens (typically delta 8 carts if that makes a difference).

I just took one of those at-home urine drug tests from CVS and it came back positive. I’m not sure how accurate they are but now I’m bugging out.

What are the chances it was just a false positive?

Could weed still be in my system after 3.5 months not smoking?

Could I test positive from secondhand pen smoke? I work in a club and people are always using pens.

Please give insight so I can not stress the fuck out. Thanks in advance