Fetal movements

My baby usually ( up until this week) has always been pretty active moving all times of the day and night ( i work nights). He moves so much I always told my husband I would def notice if his movements decrease. well now I feel like they have. I'm not scared but just a pinch curious has this happen to anyone do you think he is just developing a pattern now or should movements increase as they get older we are 24 weeks and 2 days?Thanks for the responses