Braxton Hicks

Traci
I know this has been asked before but I can't find any answers that seem to describe what I'm feeling. I'm 37 weeks and 4 days and I've been having some very light cramping in the lower part of my belly. It feels similar to period cramps. I'm figuring it's Braxton Hicks but they don't start and stop. I've just felt them consistently straight through for maybe 20 minutes. They aren't severely painful, just semi annoying. Has anyone else experienced Braxton Hicks like this? I go to the doctor in the morning but I am just looking for some reassurance in the mean time.