32 weeks pregnant please help

Got a rash all over belly , chest , and arms . It wasn't really Itching . Now, it just started itching shortly after rash popped up. May have Been itching before it popped up just thought it was my belly stretching .. Only had my feet slightly itching.. Nothing major.. I'm able to keep my self from scratching. Went to OB today ! He said not sure what it is to call if it gets worse and drew some blood. I see him back again in a week. Really worried.. Been googling and not sure what it may be! I believe he's checking liver functions I'm so scared! I love my baby boy so much! Has anyone else had anything like. This happen