back pain /shoulder pain

Do

anyone know any good sites for yoga stretches in pregnancy? the past week I've had horrible back pain, I've tried heating pad, warm baths with Epsom salt, Tylenol and now it got so bad that the on call doctor for my OBGYN this weekend has me on muscle relaxers bc I might have a pinched nerve in my back or a muscle spasm from the baby. I'm only 21 weeks along. she said I might need physical therapy, which sucks bc I work full time and I've got a 9 year old to take care of and a puppy. so I've got to get an appointment with my regular obgyn this week to see what we need to do bc the pain was so bad last night that I couldn't sit or lay down. after I got the muscle relaxers from the on call doctor I was able to lay down finally but I want to see if there is anything while I wait for my appt that you ladies would suggest? links to videos are welcome, I really just need to see if I can alleviate this pain. I sit all day at work so I'm going to ask my doctor if she thinks a standing desk would be a good option. the cost would come out of my own pocket though so I'm looking at affordable ones. I work from home for my job.