JKID22

ok so here is the deal.....I smoked up on Halloween October 31st (2008), then smoked on May 16th 2009. Before Halloween I hadnt smoked in two years, and after May 16th I hadnt smoked at all. On May 16 I took about 4-5 hits, from a very small amount, probably less than 1/2 a gram. (it came in a nickel bag, but there was probably only 1/4-1/2 of the bag left, and we used this small straight packing pipe, it was shared between about 3-4 people). I jus had a hair drug test on Friday, June 26th 2009, I was clean for 1 month 10 days before my test. I am freaking out right now. I am a white male, 22 y/o, 6'0", 180lbs, green eyes/light brown hair, maybe dirty blonde. They took the sample from my leg. Is this cause for concern????