Both of mine previous labors started with water breaking.
With #1, I had gotten up to pee, and as I was laying back in bed I just felt funny and decided to head back to the bathroom. On my way there I practically started running (as much as a 38w preggo can lol) and as soon as my foot hit the tile in the bathroom I felt and heard a pop and got a splash. But it was just that splash. I tried to pee again and went back to bed and immediately had a contraction I knew was "it", it just felt different. But I didnt have much leaking after that, I think his head just sunk really low and sealed it off. I didnt need to wear a pad even after I got up and walked around.
With #2, I woke up to a hard contraction, and tried to sit up during it and thought at first I had peed myself. But again it was a splash and then barely a trickle, but I just knew that it was it. I went to the bathroom and had a bit more leaking, but nothing major.
Baby #1 was more active than my 2nd or 3rd, but I attribute the water breaking to sex a few hours before more than anything baby did.

#2 was just the pressure of the contraction, I think... I must have been laboring in my sleep, because she was born just over 2 hours later.

This time I am expecting my water to break again. Every time I sit on the toilet there is so much pressure, I try to push!

I wear a pad for incontinence at this point anyway so I figure even if I'm out I'll be okay. But probably it will be at night again. Or maybe this time my water won't break and I won't know I'm in labor for sure! I have had a lot of "born in the caul" dreams, though I did with my 2nd too.
