Itchy!!!

I am a first time mom and I'm 27 weeks. I have been experiencing this crazy itchy rash on my arms and legs. They are small red bumps and I'm just curious if PUPP is common for some of you other ladies? I don't think it's intraheptic cholestasis, because it's rare and uncommon. But if any of you ladies have been experiencing this or in the past give me some insight! I go and see my OB on Friday.