Decreased fetal movement at 27 weeks?

I’ve noticed over the last week that my baby went from being generally very active to almost not active at all. Her heart rate is still what it has been for weeks but she just doesn’t hardly move. I have gotten movement but not at all what it used to be. I know she sits very low in my belly but is this something to be concerned with? I do have an anterior placenta but I wouldn’t think at this far long that it would make such a significant difference.