Constant tightness. Help!

Alexandra
Okay I am 29+3 and since about 6:30pm (it is now 1 am here) my uterus has just had a really tight feeling. Not like Braxton Hicks that I've had before. It doesn't come and go or change when I move or get up. It's just a constant tightness. Should I be concerned? I've had mild cramps off and on as well.