OPK? Help!!

Katie
Okay so I test yesterday with an OPK because I was just really interested in tracking my O this month and wanted to see if it matches up with Glow or any of my other apps. My fertile window starts today and I had a decent line yesterday I was assuming it would get darker through my fertile window. But today it was even lighter and I feel like I'm O today! My cervix is super high, soft, and open! Im just really confused. At least if I did O today or before I think I BD enough! Lol