Weird rash all over??? Boob pic alert!!

So all week I have had little mild annoying rashes on my body. I have super sensitive skin and just got new work uniforms so I assumed it was that irritating it. Tonight when I took of my top I noticed a rough red rash on the tops of my boob. Now I am breaking out again all over and itching to death, I’ve noticed it happens mostly late in the evening or at night but can’t find what’s causing it. Also, all week I have had little tiny hives on the underside of my forearms that never really go away. I assumed it was stress from work. Is this the pregnancy rash I’ve heard of? Calling my OB Monday morning I don’t think it’s urgent. Just annoying! 😞

I am 15 weeks btw