Watery cm

Heather • 💙Mason Robert 8lbs 11 ounces 20 inches 💙 7-29-18💙 💜 Autumn Rose 8lbs 2ounces 20 3/4 inches 4-16-21💜
I checked my cm today and it's a little cloudy but just like water I'm on cycle day 12 how long does that usually last before ewcm? Does this come before ewcm? Glow says my fertile window starts sun.