Bacterial vaginosis

Okay I'm 16, 17 at the end of the year, I'm sexually active and have been for a couple of years... For some reason in the last year I've been prone to bacterial vaginosis? I always pee straight after sex and most of the time before too, I have the iud (copper) coil fitted (January this year) and me and my boyfriend always use condoms just in case as extra protection as I've also had a couple phantom pregnancies 😪 it's that bad I'm starting to get personal relationships with the doctors at my local surgery😂 does anyone know why this is happening to me?