Hip, back, and leg pain

19w4d. Yesterday I woke up and my lower back was sore and stiff on the right side, going through my buttocks, hip, and outside of my thigh. This is making walking very difficult and I'm not sure what to do to fix this. I'm debating on calling my dr or just going to the ER. Any other mommas have this before and what can I do to fix? This is gonna be a no go for work, thankfully i work a desk job, but that doesn't really help when I can't walk out to my car to get to said desk job.