Any advice on how to stop my shoulders from hurting when trying to sleep I can only sleep on my…

Any advice on how to stop my shoulders from hurting when trying to sleep I can only sleep on my sides and it's killing my shoulders (I refuse to now buy a pregnancy pillow with 8 weeks to go) I've tried moving shoulders up onto pillow, lying pillow downwards but nothing is helping and I can't get comfy or sleep anymore it doesn't help I also have sciatica 😭😢😴💤