No problem sometime it happens. Try to engage urself with another work.
Movement can slow down as you get closer to your due date for one simple reason: the baby is running out of room to move. While he used to be flipping and rolling in your womb, he simply does not have the space to do that anymore. Less movement, then, can be a natural process during pregnancy.
A total lack of movement, however, is a cause for concern, so contact your health care provider as soon as you notice a lack of movement. Your doctor will likely want to see you to check for the baby's heartbeat or even perform an ultrasound to rule out any potential complications with the pregnancy.