Pupps rash!?

Currently 31 weeks pregnant. I’ve been having this rash for a couple weeks now that started on my neck then chest and now it’s migrated to my stomach, legs and now arms. The drs didn’t know what I had bc wen I went it didn’t spread down my stomach but instead started from my chest up which they thought was strange. Anyway the rash has been so bad I had to make a stop to the er earlier last week and have been using a cream they prescribed to me but it hasn’t been working. I’m wondering if anyone else has experienced this and how did you sooth the rash to make it tolerable. The internet says I have to wait til I give birth but that’s a whole 9 weeks away! Any tips and tricks will help

Thank you in advance