Upper abdominal pain at 33 weeks pregnant?

It's very sore and in the middle about 3-4 inches above my belly button. It started when I went on a walk about half an hour ago and I was bent over double in pain. It kind of feels like a chinese burn or a kick in the guts (not from baby) and has settled a little since sitting, but it's really sensitive to touch. It's coming and going but I don't think it's contractions as it's too high up?? and Braxton hicks aren't meant to hurt this much!!