Moving?! Help!

I am roughly 22/24 week pregnant. (they have changed my due date) I have not felt my baby move and it makes me nervous. Should I be? I have 2 weeks until my next doctors apt and I'm not sure if I should be feeling something yet or not?! I don't want to worry bc it's not good for me or the baby but I can't help it. 
Is this normal? 
Should I be worried?