I don't know what to do....

Sj`s Mommy
I'm 26 weeks and 6 days. I've suddenly started having xcruciating where my pubic bone is (the very top of my vagina). I just turned over and almost screamed. What could it be? Should I call my doctor? I was on my feet and my lower back was tight earlier but I havent had any contractions that I know of but it is kinda hard to walk....