What is going on???!!!!

Okay this might be TMI but my boyfriend and I have only been with eachother for almost a year, so you know sex is a regular thing. Well the other night he was fingering me and I had him stop because it hurt so bad. It never happened before so we were worried so he felt around to see if there was a bump or anything. My cervix felt hard and open. Like hard as stone on one part and he and I could almost fit a pinky in my cervix. WHAT IS GOING ON??!!!