Cycle buddy?

Originally found cycle buddies because my ovulation date on GLOW was CD 16 (October 5th). I got almost positive opks on CD 13, and then faint lines so I assumed I surged overnight between CD 13 and 14. Finally bought a digital opk yesterday (just got a random impulse to buy one) and to my surprise on CD 21 (today October 10th) I got a SMILEY face!!! So I guess I’m ovulating later than I thought, and the TWW officially begins. Damn. Thought I was already 5-6dpo 😂🙄