Preterm labor?

Christine • First baby, Boy- Tylen! DUE 7/25/16

I was having severe abdominal cramping last night that lasted for about four hours and it was very painful. I also had severe hip pain that shooted to my theighs and pelvic pressure. The cramps went away since early morning but the hip and pelvic pain has not and has been having an apparence for a few weeks now but has just gotten worse. What is this?

I'm 35 weeks.