Super strange rash 19 weeks

Samantha • 💙 💙 💕

I have this weird rash on my arms & legs that appeared a few days ago. No new lotions, soaps, detergent etc. I don’t really have sensitive skin so this is throwing me off. It is SO itchy! Any ideas? Trying not to bother my doctor with something so silly as a rash unless it could be something serious.