Hey Boo

at 33 weeks your bubba still has plently of time to turn...they can turn right up until 37-38ish weeks for a first time pregnancy

the sensation you are describing sounds like it could be the pressure of your baby's head in your rib cag, squishing your diaphragm and flaring your ribs

when they turn they do tend to do it one somersalt

hope this helps

xx yogababy