Change in tummy 36 weeks

Shay
I am hoping to get some insight. Please comment if you have personal experience or know someone this has happened to. So, I'm 36 weeks today and yesterday and today I've noticed a change in my belly. I'm plus sized (size 14 prepreg), but my belly has been big and round and solid since about 28 weeks and has kept getting bigger. Well yesterday and today my stomach seems smaller and more just fatty and squishy instead of pregnant and round. She is still moving around, so I think she is ok. I was just wondering why my belly would do this. Pleas help!