Well at 38 weeks you're okay to go any time, I would watch them, if they're getting closer together, or more painful, I'd go in. Usually doctors want you to head in about 5 minutes between contractions.
I'm 38 weeks. They are starting to come often now. I've started to look at the time && maybe about 10 - 15 mins apart.
It sounds like a contraction but it could be BH, how far along are you? How often do you get them? My doctor told me to take a bath, drink lots of water, and take some tylenol, if they continued as bad as they had before they probably weren't BH, and if you're not at least 37-38 weeks I'd go in if they're happening frequently just to be safe.