Maybe try some gentle stretches? I've never had pain while walking. Just tightness.
I'll be 14 weeks tomorrow. Today I went on a walk and had pain in that area. It even went down to my vagina. It eventually went way and I had no bleeding. The pain is more of a burning and stabbing than a cramp. I've described the pain to my ob, midwife and my maternal fetal doctor. They all said it was round ligament pain.