If i test negative for cotinine on a urine test is it likely that i will also be negative on a blood test?

Yes. : The cotinine is the test of choice.

Yes: “When someone stops using tobacco & nicotine products, it can take more than 2 weeks for the blood level of cotinine to drop to the level that a non-tobacco user would have & several weeks more for the urine level to decrease to a very low concentration.” REF: http://labtestsonline.org/understanding/analytes/nicotine/tab/test/