I have a urine test in 6 days they are testing for nicotine i have been quit for 4 days will my nicotine levels show 0?

Possibly: It depends on where the lab sets the cutoff. But you'll have been quit for 10 days so don't start back.

Maybe: “When someone stops using tobacco and nicotine products, it can take more than two weeks for the blood level of cotinine to drop to the level that a non-tobacco user would have and several weeks more for the urine level to decrease to a very low concentration.” REF: http://labtestsonline.org/understanding/analytes/nicotine/tab/test/