With DS, I was in denial about my signs; does that count as no signs? I woke up that morning and spent a looooong time on the potty (sorry, TMI, I'm sure). DH said I was going into labor, but I said, "No way, this kid's not coming for another two weeks!"

I then had a sudden burst of energy and then hit a brick wall and knocked out for a nap. Still didn't think I was in labor...until I woke up from my nap in advanced first stage! He was born 5 1/2 hours later...
I still don't really consider those real signs...but maybe you're talking about nothing even remotley close to suggesting labor.