Baby movement.

Hi mummies, I am now in my 23weeks pregnancy. Usually my baby is very actively moving and kicking when I woke up on my bed, sitting down quietly, eating or drinking cold drinks. Today I woke up at 11.30am till now it’s around 4hours I cannot feel any of his movements. I am not sure whether If I missed out his kicks or he changed his position that cause the reason why his movement not as strong as before. I feel his movement since 17weeks till now. Should I just i moniter for another few hours first before heading to A&E to have a check?