What does round ligament pain feel like?

I'm a ftm, currently 13w5d pregnant with twins!  This afternoon I've been experiencing a new pain... It's a short sharp pain in my lower abdomen. From below my pelvic bone ( in the middle fairly low down) up on an angle towards my left hip bone.  Is this what I am feeling? It only lasts a few seconds then goes away. And happened more when I hit bumps in my car, the road was rather rough that I drove down today. 
Is this something I need to be concerned about? Or normal?