My cycles have varried since stoping BC in January around 23, 25, 24 days. Accoring to glow and ovia I was supposed to have been in my fertile window last week but every time I took a opk it was negative. Starting with CD8, I have been still testing in the AM and still negative, now on CD 14. I had symptoms of o'ing a few days ago too. Can I have a negative opk all cycle or have I just not ovulated yet?