Yellow discharge

So I’ve been struggling with weird discharge. I went to the doctor I was negative for any stds and BV. Although I have had BV before and I was treated for it. But I’m having the same symptoms again only a different discharge and A different smell. It’s hard to explain. I’ve been to the doctors literally 3 times in 2 months. They aren’t much help. Does anyone know what this could possibly be. (I also haven’t had sex in between the 3 times I went to the doctor)