Closed or open cervix?!

I am so confused. I am on birth control, the pill and it seems like it always stays the same. It's always high, but I can't figure out if it's closed or open. I can put the tip of my finger inside of it, so I guess it's open?
I have just checked it now and I can feel something, like a small opening but I can't put the tip of my finger in. 
My question is: if I can put the tip of my finger inside of it, is it open?

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