Hi. I'm A 36 Year Old Woman. For As Long

Hi. I'm a 36 year old woman. For as long as I can remember, I have been experiencing a discharge coming from my vaginal area. However I don't believe it's a yeast infection because I see my ob/gyn for routine visits like I'm supposed to, and having been examined you would think she'd catch something, right? Also, I do not experience any symptoms that go along with a yeast infection ie; itching, burning, pain. I guess my question is, is it possible to experience a yeast infection without having the symptoms?