Not feeling baby as much 21 weeks?

I started feeling my boy move around 18 weeks. When I’d lay down he’d move a lot or if I drank cold water I’d get kicks. So much so that my sister and fiancé both were Abel to feel him move.

Now I’m 21 weeks and for the last 3 days the movements have been very subtle... I’ve been drinking juice and trying things to really feel him. But just little taps at times. I have a posterior placenta also. I’ve been using our baby Doppler daily because I’ve been nervous!

Anyone else in the same boat? I know there’s lots of room in there still so he could just be positioned differently... and I can tell with my Doppler he’s moved because one min I’ll have the heart beat the next it’s somewhere else I just can’t feel it.