It oculd be pupp, a skin condition that soemtimes occurs when pregnant. My friend had it. Ask your doc about it, cause there are diff things you can use to treat it.

"treatment can involve cortisone creams in the worst cases, but occasionally simple moisturising creams work. So can calamine cream. Long, warm sodium bicarbonate (baking soda) baths can also be relieving. You may need to be treated with oral steroids if the itching becomes intense, but this is not often the case, and is certainly actively avoided. The lesions usually go away after giving birth. Your baby is not affected. "

maybe it;s not this but you never know! Good luck!

Yeah, I have the dry itchy patches too. I have 3 children 19 and I am now expecting almost 12 weeks