I've had days where he's seemingly sedentary but it's because he's facing my spine. When I get a glass of ice, a lot of ice, and cold water and chug that he turns and starts to squirm. I'm 29 weeks and when I'm in great spirits he's in a wiggly mood, but if I'm down he's not very wiggly at all..
Definitely call your doctor or speak to an on call nurse if you're unable to get any movements because they'll be able to help in any situation that might arise. I'm sure you're both fine, maybe try the ice and water or even some ice and orange or apple juice? Keep us posted!
How far along are you? I am 17 wks today and I barely have felt my baby move. Try not to freak or stress, if you get to concerned call your doctor.