Can you tell me if i pee very little will it lessen my thc levels?

No: THC is metabolized by the liver, as are most drugs, and most of it is eliminated in bile, not urine. The amount you urinate will not effect your THC levels. How much you smoke, how often and the quality of the marijuana are what effect your levels. If you are worried about being drug tested, marijuana persists in urine tests for several weeks and even months in very heavy smokers. Get help.