At my last doctor visit, the doc told me that if I hadn't experienced it already, i could expect to feel some cramping and pressure in the near future. This is apparently common in subsequent pregnancies.
With my first pregnancy I never felt anything until I had some Braxton Hicks the week before she actually showed up. As I hadn't felt anything up to that point i wasn't too concerned. But it showed up a few days ago.
It doesn't happen very often, but twice they have woken me out of a deep sleep. It feels like a low-level labor pain. Well I say low level, but it is obviously enough to wake me up! Then i lay there in the dark for a while freaking out that I may be going into pre-term labor.
Stupid body getting ready for birth.
On the other hand, I had completely forgotten what labor pains felt like. The first time this happened I was like "Ohhhhhh yeahhhhh, NOW I remember". Remember why I'll be getting an epidural that is.