Vaginal odor.

Ever since i started this birth control (loestrin) I’ve noticed I’ve developed a strong vaginal odor. Ive been on it since January of this year. I have no other symptoms, no itching, no weird discharge. I even went a head a ran my own wet prep. This is were they swab your vaginal and look at it under the microscope for white blood cells, clue cells ( the combination of these to are indicative of BV, bacterial vaginosis) which i had non of either. It also looks for trichomonas ( sexually transmitted parasite) and yeast, also of which i had non of. So im good down there. But what is that odor. I smell myself sitting down, standing up. I started to eat more yogurt since I’ve read it help. Ive never had this before. Thoughts, suggestions.