Sleeping on left side

I have read online that your only supposed to sleep on your left side while pregnant. So I brought it up to my doc at the beginning of my pregnancy and she said that’s something for later on to worry about. Well it’s later on and I try to only sleep on my left side. However, my back pain is mostly on my left side, so when I sleep on that side the sciatica pain in my butt, back, and leg is almost unbearable. So does anyone sleep on their back and right side?