B.S.
It sounds like PUPPPs to me. I got it in my 30th week and had it until I delivered. It steadily got worse after starting on my belly, spreading to my wrists and arms. I found the following soap and I recommend it to anyone! PUPPP Soap by Rainier Soapworks (link is below). It got rid of the rash for me and kept it away for most of the time. When I did get it again, it didn't itch while I used the soap. I used the soap once in the AM and before I went to bed. Hope this works for you too.
http://www.rainiersoapworks.com/puppp_relief.htm