I have been getting bv for awhile now.  I know to change my diet up and etc, which I have. This was before pregnancy I would eat mostly greens and meat would be twice a week. I excerise often because I did sports every season. As an adult I work out 3xs a week and picked up more on meat but like 4xs a week. Now that I'm pregnant I really keep on a healthy 'diet' I makes sure my food intake isn't a ridiculous amount of sugar and what not. Drink way more water. So far I only have bv once during my pregnancy. I'm sure it's back again, due to history.