19w, flutters seem to have gone

Hi, I started feeling little flutters and rolling around 17w and felt something each day which was very reassuring to me. Now though in my 19w I barely feel anything; is this normal? Is baby ok do you think? I have my anatomy scan later this week so am hoping all will be ok, just hoping for reassurance from you experienced ladies as I'm a first time mum which means I worry over everything!