I've found d it all on my back shoulders and starting to get o. my arms

yes ive had a rash ever since i found out i was pregnant like 7 weeks i went to a dermatologist they call it CARP & i have cream for itching but it cantbbe treated until after shes born its mostly on my belly

You could be getting something called PUPPS, it's an allergic reaction, Google it that will explain it lol