Has anyone experienced this?

Serena

I'm 28 weeks tomorrow with my second pregnancy. My first was a C-section 2 years ago and basically this whole pregnancy I've had bad cramping and pain in my uterus area. I've told the NP what's been going on and she always says just go in if I have more than 4 contractions in an hour. I guess I just want to know if anyone else has experienced this pain and if you were told anything else by your OB?