Vaginal odor! HELP

I've been having vaginal odor since my 2nd to last period and I have no idea why?! I've never had vaginal odor before like this, it's not "fish" smelling or anything like that and I can't really describe it but sometimes I can smell it just coming from my underwear when I'm going to the bathroom without even trying to smell it. I've tried adding apple cider vinegar to my bath and eating yogurt and things like that but nothing helps. I don't douche or use feminine washes because I know that knock the ph level off more and cause odor so I have no idea. I don't have a yeast infection and there's no itching. I'm married and neither of us has any stds. Someone help!!!!