HELP!!!!!

I'm 30 weeks, and a first time mom, and I'm freaking out because I can rarely feel my baby girl kick ): I feel her move a lot, but she won't kick, Everytime I think she kicks no one else can feel her, till this day no one has felt her move.... I've brought this up to my Gyno and we've taken extra sonograms and they're all normal her heartbeat is normal, but I'm freaking out I really don't understand if this is normal.....