Hi!
Are you referring to Bacterial Vaginosis? I have had this once pregnant and once without, it is basically a glorified yeast infection. It is VERY uncomfortable-but shouldn't cause any harm. you can start eating yogurt to help fight the yeast, and then I would schedule with your OB to get an antibiotic-this will cause more of the yeast infection, but you can also use the over the counter creams.
Iv had it and treated it immediately 7day course on antibioticw did the trick. I suggest you treat it as i know people who have had worse outcomes by not treating it.
Ive had it twice with my 2nd. It put me into preterm labor after being untreated for 1 month but idk how long it takes in every case. You really should get it treated promptly though because its no fun and risky.