Cm and Glow question.

I don't know how many of you ladies track your cervical mucous, but I just started tracking mine a few weeks ago and I have a question. According to glow my most fertile days were Monday and Tuesday of this week. During that time my cm was just clear and watery. When I checked today it was the egg white cm. Isn't the egg white kind when you are supposed to be the most fertile? Is glow a few days off or am I just looking to much into it? Lol thank you in advance!!