Girls,

I was the same, was going to town on my legs and even scratching in my sleep! I went to the chemist and they were total life savers!!
I brought some pinetarsol gel for use in the shower on a loofah and used that once or twice a day. Then when I got out of the shower I used a cream that the chemist recommended which is safe in pregnancy and that was derm-aid. It was a total relief and within two days it had stopped me scratching!

Might help you girls!