Rash and itchy stuff

I am 11wks and 1 day pregnant and an itchy everywhere it's ridiculous I don't know what to do...but when I do wash my arm with cold water it goes away and my upper area looks like I have acne it's crazy it's really not itchy unless I just think it's heat rash and I need some type of lotion just don't know what kind please help before I make it worse lol