Mine were noticeable at around 28 wks. They start in the first trimester and they don't hurt at all its actually a pretty cool feeling I wish real contractions felt like BH lol labor would be a breeze !
mine started at 24 weeks really strong and getting worse, i have them so much, especially after i get up from a sitting or laying down position...Never felt them with my first :)
You probably just don't feel them, or mistake them for baby moving around! I noticed them at 22+ 4 my tummy gets really hard for about fifteen seconds every four to six hours so far. At first I thought it was the baby balling up until I realized the baby was in a different spot. I don't think its a big deal that you can't feel them, there is still plenty of time for them to get stronger. :)
I was wondering the same thing lol I'm 27+3 and I'm not looking forward to them! Lol