Angelique, your baby has times when it is awake and also times when it is asleep. When bubs is asleep you won't feel it moving. When you are moving araound through the day the rocking helps lull your baby to sleep and when you are lying still its more likely to wake up. Also when you are busy you are less likely to notice movement because you are distracted.
I think that most Mums will notice that thier baby has a distinct sleeping pattern. If your baby isn't moving when its usually awake you can drink something cold and lie down and see if it starts to move.