does the amniotic sac move around?

When I lay back I can feel where the baby is because my skin is hard there, like I can feel the ball and two nights ago or yesterday the hard ball was right in the middle of my belly below my belly button and just now I'm laying back to rub my belly and it's hard on my left and not my middle anymore. Is this normal? Should I be concerned? I'm 20 weeks & 1 day today exactly.

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