Why does my 33 week belly look smaller?

I went to my ob appointment yesterday and she said baby is now head down but laying to the side of me. I started to use my yoga ball to bounce on it a little… I could barley do that… it felt like my pelvic was gonna burst or something 😅 it was so sore.. my back hurts.. pelvic/cervix has so much pressure… I’m walking like I have a bowling ball in between my legs!! LOL. I can barley sleep from how bad the back pain is… when I sit to use the bathroom, my vag feels so swollen and HEAVY!!!!!!

I woke up this morning and my belly felt weird.. it looks smaller than usual ?? You can’t quite tell from the pic but it’s definitely not as rounded. Left is today, right is from 11/6.