Discharge smells like ....cheese

So... Ive gotten checked for stds. Negative.

Ive noticed a metallic but yet garbage tinge odour from my underwear when i get discharge. It doesn't smell like fish. Now...im spotting and it absolutely smells gross. Like cheese. My husband always cums in me...so im really thinking hes imbalancing my ph. I always read that bv has a fishy odour...