I started to feel twitches in the lower abdomen. At first that's what they felt like (muscle twitches) but they just remain in that same area and get more frequent and stronger! It's amazing. Im 24 weeks now and can feel bub moving all the time. It can get embarrasing though especially when bubs decided to do somersaults and knocked my bladder! Took my breath away in mid sentence! Was very embarrasing! Best of luck and enjoy!