Decreased fetal movements

At around 17 weeks my baby started being pretty active and kind of got into a routine. At 18 weeks now he hasn’t really moved too much and kind of worried. (I know kick counts don’t really start until 28 weeks however last pregnancy I had I noticed no movement for a few days, went to ER and found out she had passed.) Anyone experience this??

I do have the at home Doppler, baby still has heartbeat.

Placenta is posterior.

And I do have an appt in two days with my OB. Just trying to see if I’m not alone and calm my nerves.