How do you know when your cervix is open?

Keri
So this is going to sound absolutely ridiculous but I never knew what my cervix actually was until I was looking up online and doing some exploring on my own body. That "ball" that is inside of my vagina I thought was the G spot is actually my cervix... Imagine how surprised I was to find this out....I'm 26 🙈. So I've been reading that as you ovulate your cervix is supposed to be somewhat open? I don't understand how you would be able to feel it open?? I feel really dumb for asking this but I need help.