I'm super itchy, too, but I do have a rash (they don't think it's PUPPS but also don't know what it is)
I'm sure your fine - my skin is super dry and I feel like I itch all over, even where my rash is not. The md gave me the okay for benadryl, which is a wonderful thing to help me sleep through the night, too!
googling is dangerous though, and I had the same worries. I was nauseous this morning and vomited, so I googled...mistake!
also, don't EVER google image search rash & pregnancy, yucko!