BV is an infection that a lot of woman have. It is considered to be the most prevalent undiagnosed woman's condition. Because it is frequently undiagnosed, a test will normally be done when you become pregnant to prevent trouble during pregnancy. It is treated with antibiotics.
The signs are a stinky fishy vagina, sticky milky discharge, and burning. These signs can occur only after sex or/and your period, throughout your cycle, or not at all. It is caused by the bacterial balance in your vagina being disturbed and the bad bacteria growing faster than the good bacteria. It is not well understood why that happens, but statistically the more men ejaculated inside you the bigger your chances. The real danger level seems to be 3 men within 12 months.
With your sexual history, it is unlikely that it is a worry for you at this time.