Hi 1sttimemum - just spotted your post (this September thread is rather dead, a new one was started in July as it had got too big). Also most of the September mums have delivered so there are only 2-3 of us now looking at the new September thread - if none of us were online when you posted then that's probably why you didn't get any replies.
Maybe you've already re-posted on a different thread, but in case not, thought I'd reply.
You do apparently get Braxton Hicks throughout your pregnancy approximately every 20 minutes - presumably to get your uterus 'fit' enough for all the big contractions it needs to do at the end to deliver . However, you don't feel them generally until near the end of your pregnancy.
In my first pregnancy I didn't ever feel any Braxton Hicks and that's pretty common (doesn't mean they aren't happening), so you may never feel any contractions until you actually go into labour. I'm now 40 weeks plus in my second pregnancy and this time I have had lots of Braxton Hicks (again much more common to be aware of them second time round). However, it's still erratic, some days I feel quite a few and other days nothing at all. I had to go on a monitor yesterday to check baby's heartrate and it also shows uterus 'activity' and showed contractions about every 6 minutes or so from what I could tell, but I only felt one of the 7 that were recorded (and that didn't look any stronger than the others, which seemed wierd - don't know why I felt that one and not others)!
The title of this thread being 'anyone due in Sept 04' may not attract many more replies, so it might be best if you start a totally new thread under pregnancy with a title re. braxton hicks and then I'm sure you'll get lots of other people replying as well.
Hope all's going well with your pregnancy. Good luck.