I don't remember ever feeling braxton hicks with DS, either I didn't have them or they were so mild I never noticed.
This time (I am 25 weeks) I have noticed a 'tightening' in my bump quite a bit, bump is then quite hard for a bit. Is this BH? And how early have you felt them? From seeing other threads, people seem to get them nearer the end and I am a bit concerned at how early I am feeling them. I have been feeling them for a few weeks now, if indeed that is what the tightening is.