What did you do for sciatic nerve pain while pregnant

So recently Iv been experiencing some sciatic nerve pain. I do walk regularly and try to walk around my house as much as possibly to help with it but sometimes it’s just so bad that I literally can not move. I also stretch but maybe there is a specific stretch I don’t know about that would help! Anything is welcome.

I live on the third floor of of our appt building and it’s getting to the point where I’m afraid to leave the house because of falling down or up the stairs. I’m also 22week pregnant.