I think you should be fine. It sounds like you don't smoke a lot, so there shouldn't be a high concentration of thc in your fatty cells, which is where the chemical is stored, i believe.

Just make sure when you go in to take the piss test, pee in the toilet at first, then fill up the cup. The densest concentration of chems in your urine are at the beginning of the piss.

Good luck, and make us proud