tmi cm post

I've been tracking my cm and I think I'm pretty good at knowing what part of my cycle I'm in but my AF is due in a few days and all of a sudden I've got a surge of creamy white watery cm there is just an abundance to the point were you would think I'm wetting myself a little if you felt my underwear is this normal before AF or should I talk to my doctor my last period was late and I'm worried this one will be also seems something is off