A woman undergoes a lot of hormonal changes during pregnancy. These changes could result in the signs and symptoms of pregnancy. Mild vaginal discharge during pregnancy is normal. It is usually thin, white milky and mildly smelling and is called leucorrhea. This discharge is usually made up of secretions and old cells of the cervix and vagina, it may also have some harmless bacteria. It is said that some women may have increased white discharge as they approach delivery.