Anyone know what this could be?

So I work on cars, I do paint correction on the outside and I apply ceramic coatings to the car.. recently I have had a ton of work just flow in so before I would have work then I would have three days and then get another car well for the past month it’s been work everyday nonstop. I am also 22 weeks pregnant and recently after work my bones in my arms are hurting soo soo much when I get home to where it hurts doing nothing. It’s not muscle pain it’s my bone.. anyone know what this is?