Pressure after swimming?

Lily-Anne • Fighting PCOS. 2 losses.
I went in the pool for the first time in years today, and I'm now feeling light pressure in my hips and lower back pain. 
It feels like she has moved lower? 
I'm 32+4 and haven't experienced any braxton hicks or anything yet, so I'm thinking she's just moved into position? 
Has anyone else experienced this?