Can anything be done for pregnancy back pain that's safe for the baby?

I think I spoke too soon when I proudly stated to many friends/family that I haven’t had much pain in my pregnancy. The past week it’s been brutal. The lower right side of my back has an intense burning sensation shooting through it. I assume it started because I’m growing larger and the baby is pushing on it more? Whatever is causing it, I just want to know if there’s anything safe I can do to help it. I moved like a snail at work yesterday and felt completely useless. Walking is an effort. Sitting doesn’t help. Laying down sometimes makes it worse. Is this a normal symptom during pregnancy? I’ve heard of back pain but is this how intense it usually is or am I just being dramatic? Tylenol does nothing for the pain. Any suggestions?

I’m 21 weeks in case that matters.