How far along are you? I don't feel kicks much anymore at all, for the last few weeks it's been wriggles across my stomach or just some limb poking into my side! My little one hiccups constantly too.. like 7-8 bouts a day. It must be so annoying for her!
If you are feeling definite movement, I'd say everything is probably totally fine and baby has just moved position or generally just has less room to physically kick as much. But if you think the amount of movement is low, I'd 100% get yourself checked asap. I've been for monitoring a couple times when baby had a lazy day.. they never make you feel bad. I'm always told not to hesitate if I'm worried.