26 weeks n 6 days. Worried!

My baby started making small movements and they were getting pretty strong. It was an everyday thing and I was getting use to his route. But I went to my doctors appointment and I know there's still some movement I can't feel cause of how early I am. Now all of a sudden I am only feeling a few kicks/movements every other day. Its odd to me. I went back in to make sure baby is alright n he's heartbeat is fine. I'm jus a lil worried. Don't know what to be worried about. Or how come he isn't being as active. Has anyone else experienced anything like this.