Can’t sleep on the left.

I am 20 weeks this week and I have not been able to sleep on my left side for the past 3 weeks. It is painful and sleeping on the right side for a long time gives me the sciatica nerve pain on my buttocks, hips and legs. So turning to the left side becomes futile. I have already bought the U shaped pillow and the side pillow. Both doesn’t help. Anyone has this problem?