itchy rash- need advice

I have a itchy rash on the back of my hand and some lumps that itch on my arm. I carnt get to my gp/midwife until late next week as there are no appointments available. I don't want to go in to a n e to be laughed at and sent home as it sounds silly. I'm 35 weeks pregnant and it itches so bad. Has anyone had this and what did it turn out to be? I've never had exma (however you spell it lol) and never had a rash like this before. Any information or advise would be appreciated. Thanks xx