Rash help

Kandi • Mom to 3 beautiful girls. Expecting august 2020

Ok ladies I have a rash that started on my stomach right after I found out I was pregnant. My dr prescribed me steroid cream told me to take oatmeal bathes and benadryl nothing is helping. I will post some pictures I'm only about 12wks pregnant. Any ideas what this could be? Have any of yall had anything like this if so how did u treat it my appt isnt until next week. I'm so tired of itching. Excuse my hairy legs and stretch marks