weird movement in belly

This may be dumb.. idk. But I haven't really felt my baby move in the past couple days (I'm 26 weeks) and all of a sudden he started kicking today. After about five minutes of subtle kicks, my stomach starts shaking pretty violently for about 30 seconds, and now he's only kicking once at a time and it's so soft I really have to be paying attention ... I'm just wondering if that's normal or if anyone has experienced that...