Ovulation Question

K • momma bear and wifey ;)
Question about ovulation ! 
For those ladies who feel their cervix for ovulation, I have a question for you! 
My cervix has felt hard up until today. It feels like my lips instead of the tip of my nose. But I have zero fertile cm. 
should I go by my cervix or cm?
I feel like maybe I don't produce fertile cm 

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