Cramping or growing pains?

This may sound stupid & I apologize if it does but I’ve been having what I thought was cramps but now I’m wondering if it’s growing pain. I’m 18 weeks 3 days today with my first child so this is all new to me. No bleeding or anything else. I have a at home fetal doppler & was able to pick up on her heartbeat for a few seconds this morning then I’m assuming maybe she moved.