Watery period

I am due for AF in 5 days and yesterday and this morning i had a lot of thin clear discharge. A few hours after being awake i wiped and noticed faint blood. A few hours later and i have a small "dribble" of blood in my panties but when i wipe its watery, thin clear mucousy blood. What is this? Im not on BC and havent been in 2 yrs. I havent changed my diet or exercise. Never had an early period or an early period that was so watery looking.