Can bv prevent pregnancy?
BV won't prevent pregnancy.
BV is an imbalance / overgrowth of some bacteria in the vagina. Since sperm is basic and not acidic, having ejaculate in the vagina increases the pH and causes BV. Normal vaginal pH is less then 4.5. Some women have BV without sexual intercourse, and for some reason the normal vagina flora is disrupted. It is not known exactly what causes BV in some women.