I'm on my 2nd round of antibiotics for BV and it still doesn't seem to be working. Does anyone have any idea as to why the antibiotics are not working? I am extremely sore and red down there. I was tested for other STI's and they all came back negative. I was tested for HIV 3 months after I had sex with a new partner. Should I get a retest? What else could be causing me to have BV?