Is it normal to have decreased movemeant at 20 week ?

Kirstie

So been feeling baby for the past week even on outside too but today Iv barley felt it move at all I have my scan on Thursday and cause I have to go by myself I’m praying everything’s okay , I have felt the baby move but not dancing like I usually feel or rolling just making me abit nervous , like o don’t even feel pregnant today which has me worried