Will I test negative?

Hello Friends, I was recently hired on short notice and had to pee in a cup. I'm a fairly infrequent smoker, once a week if that, and only 1 or 2 hits on the bowl when I do smoke. Prior to the test I had 2 puffs on the pipe Saturday night and then nothing more before I tested on Wednesday afternoon. Prior to going to the lab, I stopped by the drug store and purchased a FirstCheck kit that claimed to be >99% accurate. I peed in the cup and a strong and immediate "negative" result showed on the strip. I'm in good physical health, 205 pounds, 5'11" and excercise regularly. My question is: will the lab sample also show "negative" as did the store bought kit? Thanks for any insight.

If the U/A was last Wednesday, did you recieve your results yet?

evidently I tested negative because I am working for that company. 4 days must have been enough to clear the THC metabolite. thanks