Rash?

Becky • Pregnant with my rainbow baby ❤️❤️❤️
Has anyone else experienced a rash like this before in pregnancy? It covers my whole bump and has appeared out of nowhere and spread in the past 48 hours. Nowhere else on my body is affected, and it's extremely itchy. I went to see my GP today, and they just said dry skin, which I know for a fact it is not. So just curious if anyone else had experienced the same and what their diagnosis is/was? 
I'm 32+5! Thanks ladies 😘