soooo I need some feedback... I'm 34 weeks today and a little while ago a crampy pain has set in in…

soooo I need some feedback... I'm 34 weeks today and a little while ago a crampy pain has set in in my lower back and my lower belly like my pant waist line just feels really sore... it feels like a contraction that is just constant...no stop or start just set in slowly and is radiating continuously in the areas I have described..anyone else experience this before?