Birth control.

Since I was 18 I started taking birth control. Can it effect my vaginal odor? I have this unpleasant smell that occurs everyday. I've been to the doctor and she ran tests on me and everything came out negative. I've tried taking more showers including using vaginal products in the shower and it still doesn't seem to help me. I need help. Can someone please give me advice on what to do? Is it my birth control?