Wow that was painful!

I'm 34 weeks and last night I woke up to a bad stomach ache that turned into extreme lower back pain that turned into sweat dripping off my entire body I was haveing contractions bc the pain was so intense I was shaking then I made a bowel movement which helped some of the pain then vomited 3 times, through this all I was doing Lamaze bc it was the only thing I could do to help with the pain and my contractions. Once all done I took a shower bc I felt the need to find something to relax me and be clean. I have had kidney stones before and the pain was actually similar but then maybe I thought I was having a gallbladder attack. But then is it a sign of preterm labor? Ugh man that was rough. Anyone ever experiance this? I should probably call my oby/gyn.