1 smelly pit

I know the body guess through a ton of changes during pregnancy so here's the deal: lately I've noticed that my left pit smells terrible, no matter how much I shower, no matter how much the deodorant nor the brand my left pit just begins to smell musty. I'm a very clean person, OCD n fact and find it puzzling and annoying that I smell bad and that is just the one pit that smells. I've even give as far as to use male deodorant since it is stronger than female brands... Does anyone else suffer from this?!