I took a hit at thanksgiving 2013 beforethat I took a hit Christmas 2012. My job does random test mostly urine but a couple lately have been hair. Should I be worried off that one hit

I'm not sure I'd say just drink a bunch of cranberry juice just in case

Off one hit? No. Hair tests are meant to detect habitual usage. If you get stoned every weekend then yes, but if you had a joint one day then it shouldn't be an issue. They're only good for about 90 days anyway.

Considering the random drug tests, I would look at stopping all casual drug usage. Better employed then on the street.