Just had a letter from the hospital with results from a swab to say I have got BV and need antibiotics. I'm 20 weeks pregnant and have had spotting on and off throughout the pregnancy so far. Could this be the cause? The hospital found no reason for the bleeding on examination. The swab was taken 2 weeks ago and I'm now worried about how long I could have had BV without treating it and worried about the baby. Anyone else had this?