I'm 21 weeks today and have been noticing what I think are Braxton Hicks (if I'm remembering correctly from my last pregnancy) for the last two weeks or so. They're not regular and not uncomfortable. I just don't remember getting them quite this early last time around!
Braxton Hicks yet, anyone?
For me, right now I frequently feel a very definite tightening. I remember in my last 2 pregnancies, sometime after 30 weeks, my whole abdomen would get rock hard. It wasn't painful but something you definitely notice.
Ok then I probably haven't had that yet :) He is so active though! We had so much trouble at the ultrasound because he wouldn't sit still long enough for her to look at anything. And yesterday at my midwife appointment they had such a hard time getting his heartbeat because he kept kicking the doppler! They said he is probably going to be an athlete.
I never felt a single one with my first. I may have been having them, but certainly did not notice. I have noticed them with each of my other 3.