If i was using marijuana before 19 to 20 days weher it will shows in my blood and urine?

it all depents an your bmi or fat to muscle ratio since THC or caniboid cling to the fatty cells in your body if drink a gallon of water every day for 5 days and every day also drink at least 20 oz. of cranberry juice not cocktail! u will be clean as something that is very clean