Bacterial vaginosis

Anyone else had trouble with bacterial infections during pregnancy? I'm 7 weeks and 3 days and have already been treated at 4 weeks and 5 days with oral antibiotics  but the infection has returned. The doctor wants to try Metrogel this time and I wonder how safe it is to use during pregnancy. From what I have read on it there hasn't been sufficient testing done to show the risks to an unborn baby. Has anyone tried Metrogel?