Also the body will use every avenue at its disposal to eliminate toxins, and this includes the saliva glands as well as the main organs of the liver, kidneys, lungs and skin.
Discharge, such as that you are experiencing, is yet another method of elimination by the body, so it should be of little concern.
I think you will find that as your fast progresses, this discharge may increase before it ceases altogether, as toxemia is lowered and then eliminated.