PUPP Rash?

Going to OB today, but I’m 33 weeks preggo and have developed a rash like this on my belly, back, legs, arms, and butt. Like within 2 days I went from only my belly being itchy to my whole body looking like this. Any suggestions on how to calm it or help the side effects subside? I cannot get comfortable at night and just wake up over and over scratching myself silly. People have said it could be bed bugs but the rash started on my belly and my husband doesn’t have any bites or rash.