Hard ball in cervix?

Jessica • ⛪️ + 👫 + 👶 + 🤰 = ❤️
First off, I have never been good at checking my cervical position. I've been to the gyno recently, and he assured me that everything looked very normal. 
My vagina tilts to the left side, and when I insert my middle finger, the first thing I feel is a hard ball. It feels about the size of a quarter or golf ball. I am able to push around that and it feels soft. 
Is this normal? Has anybody else ever felt this? What is it?