The Braxton Hicks do get stronger towards the end. With my first, I was determined NOT to go the hospital and mistakenly think I was in labor. I woke up early one day before work, cramping pretty good, but irregular. I f did have a bit of blood when I wiped, but thus can happen towards the end to. I go to work and the pain gets worse...to the point I was having hard time breathing and standing, I kept gripping my desk, hunched over. Finally my manager said I should call the doc. I had just had am appt like 2 days before and everything was perfect. So i call, they say come in, and I was 4cm! He told me to go straight to the hospital, no stops, but I was alone and wanted my mom and husband. Plus I didn't have my bag. I asked him"doesn't the first take longer?" And gee said yes but everyone us different, and at 4 cm there was no time to test it...I still stopped by my house and then my husband's work to pick him up cuz I couldn't drive it hurt so bad. I called my mom crying, it was do much worse than I thought...
Luckily i hit 5cm then stalled out for about7 hours, so plenty if time for an epidural....
But then I suddenly went from 5 to 8.5 in an hour....then stalled again....
Moral of the story, just pay attention, and remember SOMETIMES even "real" contractions are irregular in the beginning - they were for me with both boys. It took awhile before my contractions to come at regular intervals. Now, of course, I can feel the difference, real contractions are Braxton Hicks times 100, at least for me. Plus, usually you'll feel it all the way around to your back.