worst pain at 37 weeks!!

Yesterday I was walking almost all day ! And through out the night I had the WORST vagina pain literally felt so much pressure, tightening, ugly cramping to the point where if I wanted to get up I couldn't even move and had to hold on to something!! Every time I would get out of bed it just hurt or even while I was just laying down I felt the pain! Has this happened to anyone ??? I'm 37 weeks