Alright I'm going to try to explain this the best i can

Whenever I feel my baby boy move sometimes it feels like he is pushing, so I will go to feel him. Sometimes I will push down just a little and i feel a knoby like thing. It used to be where he would pull back right away but now he kind of lingers. Could I be feeling like an elbow or something? I'm 30 weeks and curious if anyone else has experienced this