J.W.
I had the same problem during my last preg. which was 11 years ago...lol. But I remember it driving me nuts. It was the top of my feet. I would itch them on the carpet till I had rug burn or they bled...I know..gross...but I couldn't help it. Unfortunatly...I do not have a cure for you. I personally think it had to do with circulation...because it seemed so much worse if I had been on my feet a lot that day...so I tried to keep my feet up at much as possible. Sorry I can't be of more help.
Best Wishes!!!
J.