Movement /Doppler

Hey ladies!

I'm just a day shy of 20 weeks. I have an anterior placenta; and have slowly started feeling movement every now and then.

My question is, I have a doppler, and for the past ehhh day and a half, I have been able to find her heartbeat in the same exact spot. Is that normal? I figured shed move a little bit but its always in the same spot I found it before!

I have my anatomy scan Wednesday and I'm just a tad bit nervous something is wrong.

Thanks ladies! Xoxo