I'm 27 weeks pregnant, this whole week I been feeling my baby boy go from being super high then drop, other times he is…

I'm 27 weeks pregnant, this whole week I been feeling my baby boy go from being super high then drop, other times he is pushing my stomach out so far it's hard to walk and stand up from the couch and other times he is hiding the my stomach looks flatter, I look like if I am a month or more less then what I am. Does anyone else experience this? Is the normal?