Constant/continuous Braxton Hicks?

It is Sunday night at 10:30, on Tuesday I will be 37 weeks pregnant. I have had this happen before.. but it's pretty strong now. I have had like.. one constant braxton hicks contraction for a couple of hours now. My belly is sooo tight and it isn't letting up even for a second. I have had it last for two hours before and then go away, but never quite this tight. It does not hurt, is just very uncomfortable. I tried standing... laying on my side... and I just drank a lot of water. This is not dangerous is it? Any tips?