What does round ligament pain feel like?

Cat

I'm 13 weeks, and starting last night I started getting a stabbing pain in my abdomen. It almost feels like a stomach cramp/gas, but it's all around, front and back. I felt it during the night while in bed, and then when I stood up and tried to walk to the bathroom this morning it intensified.

This is my second pregnancy, and I didn't experience this last time. I have an appointment next week so will bring it up with the doctor, just wondering if this is what round ligament pain is or maybe something more worrisome?