I'm 34 weeks pregnant. I've been experiencing stomach cramps and pain in lower stomach area for a couple hours now. It's a constant pain. Any ideas?

Please call your OB. Asap ! could be premature labor, want to make nothing else is going on also not normal to be having those pains, if i was your OB i would instruct you to go to the labor room to be evaluated please call your OB now !
Rhythmic pain? It the pains can be "timed" at every so many minutes, then you need to contact you OB md which isn't a bad idea if it is not so that an exam can be done.