Weird feeling

I will try to describe this best as possible.. While at work all of a sudden it felt like something dropped in my lower abdomen then my tummy felt smaller even tho it still looks like my baby bump I'm getting. I'm 19 weeks today my friend said maybe the baby was sitting on my bladder or something and shifted and relieved pressure that may have been there or something? Nothing hurts just the weirdest sensation ever! Almost like I felt bloated I guess and then it suddenly went away maybe is a better way to describe it. Any ideas? 🤔😮