Change in movements...

I felt a little strange today when I came home from church. I hadn't felt my baby move as much as usual. He's still been giving the occasional nudge, so I thought everything was fine. I drank some juice and all was quiet which confused me. He's usually CRAZY after a cup of juice. Well I laid down to go to sleep and for about an hour there was nothing. I felt a sudden jerk and now there are two places where I keep feeling movement but it's not like the kicking I'm used to. It feels more like rubbing or something. Is this just a stage babies go through or should I get checked out? I've never been pregnant before and I'm kind of scared. Oh and I'm 27 weeks as of today...