Opk and ovulation help

Hello ladies,

I have been using opks for a few months.. have never had any real issues. Jump to this month... and i had an "almost positive" second line yesterday morning..just wasnt quite their.. and last night i tested and it was a very negative one line opk.

Did i miss the surge all together? Although, Ive had recent months of 2 day positive opks.

Or maybe i havent ovulated at all? I am CD 17 on a usual 29 day cycle.

Thanks