Reoccuring BV

What are your experiences with BV (Bacterial Vaginosis)? I had it a month ago and took a round of antibiotics. Good for two weeks and now I smell something down there again. Do I need to change my soap or laundry detergent? My doctor told me it's not sexually transmitted. I am annoyed though that just got rid of it and now I smell something again, but I don't have any other symptoms. The last time I had it, I had itchy and red vulva.

Please help! I am dreading another doctor's visit and another round of antibiotics. It might be inevitable though.

Ps: I have had unprotected sex recently and I'm pretty sure it's not a yeast infection. Also just got done ovulating.