Can I relate to anyone?

My baby is just not a active baby. And it scares me every day he will go a few hours a day without moving.
Mostly I get his kicks in the evening. How am I suppose to do my kick counts if I have a mellow baby that will go hours with our kicking? When should I be worried? I have a Doppler he has a strong heart beat everyday. I just don't know what's normal. Also I'm 30 weeks.