Aww sayang, GBS memang boleh balik keluar keputihan macam tu especially towards end of pregnancy, hormones and all lah. Tapi sebab you dah kena GBS before, best you mention to your doctor at your next checkup or call clinic awal-awal je to confirm semua okay, especially since you're getting close to labour time. A few of my mum friends had the same worry and doctor reassured them it's normal, tapi they did a swab to be sure. Don't worry too much lah, but jangan tunggu sangat, better safe than sorry kan, especially with GBS history. How are you feeling otherwise?