Can hear heartbeat but no movement?

I’m trying to calm myself down before my anatomy scan on Friday.

I’m 20+1 with my second, & so far I haven’t really felt any movement. I felt my son by around 19 weeks which is why I’m starting to worry.

An Anterior placenta was never mentioned at my previous ultrasounds, but I haven’t had one for 7 weeks. So I’m not sure of placenta location 🤷🏼‍♀️

I do have a home Doppler, & can locate this little ones heartbeat in the lower left part of my stomach. So I’m trying to tell myself that everything’s okay.

Is this something I should be concerned about? Or just take some deep breaths & calm down until Friday?