Rash all over my body, is it just a heat rash ?

Hi I have only found out I am pregnant 2 days ago first baby and I have now come up with a red rash all over my body, and am really itchy I normally never go to the doc about anything, but now it's just not me to consider ! It looks like a heat rash, I have an appoint me with the doc on Tuesday, should I get looked at before ? Should I be concerned or is this just my hormones ? Thanks 😀