How do you know if your cervix is open?

KeKe

My birth control stops my period so I want to track my cervical position to help me noticed and changes. I just don’t know exactly what it’s supposed to feel like when it’s “open”. Right now it is hard but I can feel a definite indent that and can nestle my fingertip in. I definitely won’t do it, but it feels like I could push my finger in their if I really tried.