Keep Getting Bacterial Vaginosis From HIM (particularly)

Me and my loved one always have sex raw because we are together and I’m about 7 weeks pregnant by him. I’ve noticed that I’m always getting bv whenever me and him have sex and he still cums in me. One time I let him use a condom because I was doing an experiment on to how my vagina was going to react with and without a condom. Neither of us have any other partners or no STDs. I hate that I keep getting bv from after having sex with him because I hate always having to take antibiotics and I hate the smell that my vagina gives off during sex from the vaginal discharge. Does this mean that he doesn’t clean himself down there well? How do I stop this from happening??? Does my vagina not like his penis????? Please help and comment below...