Baby's movements 28 weeks!

Leila • Due Oct 4 2015 with baby boy Mason Jeffrey❤️❤️❤️
Is it normal for my baby to literally be kicking and poking a prying alllllll day long? During night too? I feel like there's no way he could be getting any sleep in there. And also, I'm 28 weeks; shouldn't my belly button have protruded by now? Or does everyone's not go outtie?