Opk mystery 😩

I take ovulation tests from the day my period ends because my ovulation varies in days from CD9 - CD15 (I’m under GYN all investigations fine) I am now on CD 17 and no positive opk but I never get super positive ones anyway, I looked back at the pictures I have taken within the time frame and noticed this one from CD13

Ive had nothing but really faint OPKs since so I was just wondering if I should class this as my “positive”?

I can see looking back when I took the picture it’s still a little pink so wasn’t finished developing properly probably.

TMI but I had a lot of EWCM this day too and Glow says it was very close being positive though and then the next day nothing and same since. So not sure how to take it! Do I class this maybe?? Thank you! x