While carrying a child even the tiniest of abnormalities gets us worried. This is true in case of vaginal discharge that might become excessive while pregnant also. Even under ordinary circumstances many of us have a thin, milky fluid which discharges from the vagina known as leucorrhea. However if your vaginal discharge during pregnancy is accompanied by a burning and itching sensation, and has a fishy smell it may be Vaginosis that you are afflicted with. To obtain relief from this infection you need to go in for formal bacterial vaginosis treatment.