Quick question

Brianna • FTM-June.04.2016, i love you son👑💙🚘
So im 28 weeks and i feel my son kicking all the time, like hes doing karate or something. When am i gonna start getting the tummy rolls? i see his pops on my belly all the time from his hands and feet..but when am i gonna start seeing him actually roll? Or if at all?