Pre AF Discharge???

Expecting my AF on Saturday, 9/27. All day today I thought AF had started early but really I am just leaking clear discharge. Enough to be on my underwear. It doesn't appear to be an infection or anything really concerning but I don't recall ever having it before my cycle begins. Anyone had this type of discharge before AF or more importantly could this be something seen by some before finding out they were actually pregnant?!?!