Hey so not sure if this is correct forum, but drug test question I cant find an answer to!

Hey grass city, first time poster here. So I recently took a drug test. It was a 10 panel test and they marked the results as negative initially. It seems they did another test on it and said it is positive for b. I didnt hear any further results. Initially I was thinking they were testing for b vitamins and the positive would be good because I didnt over dilute, but this has been running through my head and I'm now thinking it was test b since the first test perhaps had a faint line? I'm stressing out really hard and would like to know your guys opinion. I was passing at home tests with dilution method and the line was faint but clearly there. Has anyone heard of testing for b vitamins or am I problem screwed on this? Thanks in advance! If it matters it's been 34 days since last smoked, I have very little body fat and urine was pretty clear(always passed at home like that) I'm hoping someone could put my mind at ease but want the truth. Thanks in advance!