Showers are not fun! At all! I can empathise with you... Water pressure always seems too hard, the temperature is rough (keep adjusting it)... I end up stepping in and out of the water so much. The only RSD free spot that I kind of like having the water spray on is the front of my trunk, but then again sometimes I hurt there from the radiating pain from my back!
Drying off is about just as hard! Ugh... not something I look foward to, but I have to do it- and want to smell clean!
I try to do it as fast as I can (not very fast!), and when my pain is at it's lowest- usually early afternoon.
Oh, yes- and it always takes me time to "recover" from the shower! Sometimes quite a while- knocks my breath out and always drives the pain up.
Baths might be easier than showers, if you can get down in the bath (I cannot get down in the bath, so I just stand in the shower holding onto the safety rail).
Gentle hugs

, and I wanted to say welcome, Heather!
Congrats on your pregnancy- I hope all will go well.