Braxton Hicks

I'm 36 weeks and I've been getting BH a lot no matter what I'm doing- sleeping, sitting, lying down, standing, and walking. Just recently they've been accompanied by cramps/pressure in my lower abdomen. My husband and I took the dogs for a walk about an hour ago and my stomach was tight and crampy the entire time. I immediately laid down and have been getting BH with pressure feeling off and on the past hour. Has anyone else experienced this and what did you do?