Today I walked a few blocks from my office to a clothing store, and by the time I got there I felt really bad cramps. It was lower abdomen, and felt a little different than round ligament. Just "fuller" cramps. My uterus didn't feel like it was tightening, so don't think it was Braxton Hicks. I had to sit down in the fitting room. No spotting, and I've been drinking lots of water! Anyone else experience cramping after/while walking?