Ovulation but no opk+?

Today is cycle day 13 (typically 28 days tho last month was 31). I have ewcm, tugging behind my belly button, headache, high sex drive, and twinges in my lower left abdomen. All of these things say possible ovulation.

I've also been using opk s for a week and no positive yet. I've had small surges where the line is progressing to darker but then tapers off again after a day or so, but none matching.

So... What gives? I had a slight dip in bbt but am waiting to see a distinct rise. Anyone able to give hope or insight to calm this girl's nerves?