what should i do?

Doc request that I count baby kicks starting last Saturday. Until yesterday baby is still very active, and kicks more than 10 times (normally will kick 1-2 times per hour, 12am-7am only will reduce), but today the baby is not that active suddenly, and it has been 7hours since 9am, baby only kick once, normal movement also not much... should i go check with doctor tomorrow? or is it normal....?