Recurring BV

so since I had my son I've had BV about 4 times in the last 9 months. it's embarrassing, uncomfortable and extremely frustrating. it seems as soon as I'm good for a little bit it comes back. seems to come back after sex or after a period. before having my son I had only had it once years ago and now it's all the time. any one else go through this? im getting so tired of this. 

to add...i haven't changed soaps or hygiene routines, I wash my sex toys regularly and am no longer on any sort of birth control. I have no idea why this keeps happening.