BV coming back

I have bv, doctor wrote me a script. Which was awesome and got rid of it for about a month, started coming back, he wrote me another script, but now its close to my period its WORSE than its ever been! But I'm three days late, barely cramping, and I have an appointment to go back tomorrow to do further testing (but my luck I will start and not be able too) anyways, my question is does anyone else have this problem? Could this cause me to be late? I always have a set period and its never late, yes I'm sexually active, no we don't use condoms or birth control, and yes he cums in me. No I don't think I'm preggo, I'm not like most, I'd rather wait on a kid until I get done with school. Any comments or suggestions will help. Thanks