Vaginal odor?

So for awhile I’ve been feeling like I smell really strong down there. It smells nasty to me. I’m almost 20 weeks pregnant and have felt like this way before getting pregnant. I went to the doctor they said yeast infection, I took the pills. I still felt like I had it so I went back and got more meds, a shot in my ass and an std swab. Everything came back normal. I still felt itchy, gross, stinking down there so I went back again. They said they wouldn’t give me any more meds because they didn’t want to mess up the bacteria in my body?

Flash back to now a few months later,

I don’t get itchy. I just have a stink down there and tons of yellow discharge. I brought it up with my OB and she wasn’t worried!! My baby daddy cheated on me so many times, I’m so worried I have something! Why doesn’t anyone care?

Does anyone have any idea what it could be?! Tips?!