left side pains

Chelsea

I'm 38 weeks today and last night I went to bed with a really bad cramp in my left side of my stomach. I thought I'd sleep through it and wake up fine but it's still there. I called my doctor and she said just drink water but it's been 3 hours and no change still. is this a sign of labor or is the baby just sitting funny? it hurts just to move sides when I'm laying down