spent months testing on day 12, day 13, day 14 like the box suggested. my cycles ranged 32-40 days though, sometimes skipped entirely. so yeah. the window was all wrong.
what actually worked: lab testing instead of strips. got my lh tested on what i thought might be ovulation day, got a number. a week later, got it tested again. the surge showed up in the results, not on a pee stick.
the metabolic piece matters too. i tracked my glucose with a cgm and noticed it always dipped around the same time my lh labs spiked. so the surge wasn’t random - it was tied to my metabolic cycle. cycle length + lh labs + watching glucose patterns = i finally knew when ovulation actually happened.
took my endocrinologist saying “your cycles are long, stop testing on day 12” for this to click. nobody mentions that opks assume a pretty standard 28-day timeline. what worked for other people with irregular cycles - did you do labs, or find a different tracking method?
anyway.