Thc levels

What is the lowest that it’s detected? I have a drug test for a hospital job. I haven’t smoked weed since Jan 1st. I was clean before then. Only smoked with some friends the Saturday before and then New Years. I tested myself a few days ago. I got two different tests. One was multi level (15,50,100,150) and the other was a pack of strips that tested 20. I also did take these early in the day with darker urine so it would be consentrated. I’m just concerned because those are the lowest level test strips. I really don’t want to do a detox before which why I decided to do it naturally.

I also had fungus on New Years but I was told that leaves in a few days.