Frustrated!

Kim • TTC #3 for me. #1 for my SO.
This would be our 4th month TTC. According to this app, I should ovulate this coming Thursday. I had some light cramping on Friday so I went home and took a opk. It was super slow reading so I didn't check it again and actually forgot about it. I looked at it Saturday and saw it was positive. I took another one Saturday and it was barely there. Has anyone else ovulated a week prior to prediction? If I ovulated Friday, I would've ovulated only 10 days after the first day of my period. I feel frustrated bc I feel like this was a wasted month. 😔