well, I did LOTS of walking the week before my due date with my first. Then at about 7am on my due date I got up to visit the toilet, where my waters broke (but I thought I had just gone to the toilet :o I was very tired!), so I went back to bed and to sleep for a few more hours. When I woke up I was just laying in bed, and I felt a little trickle - which felt exactly the same as a period starting, I got up and rushed to the toilet, and the trickle kept coming, then it twigged that my waters had broken!

We went for another walk that morning, and I started having mild contractions (around 10am) all through the day, but nothing serious. We decided to go to the hospital that night since my water had broken (I was very naughty not telling them sooner

), they said I'd have to come back the next day for an induction. Which I did. The contractions kept going (I'm talking MILD - but I just thought I was awesome and labour would be a breeze!

lol! ). They were doing something though, by the time they induced me I was 4cm dilated (and on the edge of actually going into labour anyway...) and then contractions started! Heralded by me vomiting everything I'd eaten, lol!
Wow, that was long...
My second labour started spontaneously after a week of mild contractions, 5 days after my due date. When it kept on waking me up in the middle of the night I figured I'd take some notice, and when I threw up in the shower I figured it was time! lol.
You'll know they're real contractions when the stop you in your tracks, when you just
have to stop everything you're doing and focus on breathing through it.