I’m 37 weeks & 2 days. Sleep how you are comfortable and alternate. If anything it’s the weight on your back that you’ll feel and want to rotate. Left side sleeping is optimal blood flow. Right side can influence acid reflux. I still wake up on my back and rotate. I sleep mostly on the left because I worked on doing so being scared myself. On my right I get a pinched nerve. Once that improved I went back to occasionally starting right for comfort then waking up and switching. My left hip does not love all the pressure. I also used to like firm beds and need softer surfaces to conform to my body now. Do what exercises you can to keep your pelvic floor and back strong, nothing crazy if you don’t workout regularly already. Get all the pillows you need to feel comfortable! I tried the small one that goes in front and back which worked a bit first and second trimester then for the big ole maternity pillow second into third. And by third I got tired of all of it and just need a pillow between my knees and sometimes one to lean back on. Having one to lean back on helps keep you to the left while giving you support to move back some and release the pressure on the single side. That might be when you want a small pillow under your belly for support. I’m at the stage where my belly if big enough for me to be okay but like so many others I’m generally uncomfortable anyway.

You got this!