Oh it also depends on where your placenta is. I have an anterior placenta... if baby is positioned right behind it i feel very litte or gentle nudges... then other days baby moves away and i feel them stronger!
I am in my 24th week and my daughter sometimes will kick hard an other times it will feel like a little butterfly or fish in there.
I wouldn't stress at all. I had days where I didnt feel anything right up until 26wks... even at 32wks I have quieter days followed by active ones. X