I'm 16 weeks pregnant I have thought for a week and a half that I had a yeast infection. Sunday took monistat 1 as of Thursday no change, doc called in another script Terconazole, started Thursday night. Still no change. Starting to think I have bacterial vaginosis, and have read this can cause a second trimester miscarriage. How long do I have to treat this before it affects my unborn child? I can't even call my doctor until Monday.