Flutters

So I’m almost 20 weeks. I started to feel flutters around 16 weeks. Weeks 17 and most of 18 were flutters all the time. But now the flutters seems to decrease. I haven’t feel her much in a few days. I tend to worry, i know the doctor said they will be more consistent around weeks 24-26. Is this normal to feel the baby a lot and then all of a sudden not. We went to the doctor last week and everything was fine I just tend to worry when I don’t feel movement.