Hives!!!!!!!!

I am desperate!!!! Currently seven weeks pregnant and this is my sixth day in the hospital with uncontrollable hives all over my body . They are giving me iv Benadryl and Pepcid and have been on steroids but they stopped those . The hospitalist doctor is convinced this is due to pregnancy but my OBGYN says it’s too early. I’m at a loss and weary. Has anyone ever experienced anything like this????? Any help appreciated I am seeing an immunologist , allergist , and Dermatologist tomorrow