Thanks for your query
Considering the type of skin rash that you have developed, there are two possibilities that I can think of.
Either it is a fungal rash
or it is an insect bite.
It does not seem have any relation with pregnancy rashes.
Treatment of the same varies from using topical steroid
to topical antifungal
Since you are pregnant, it would be better to consult a dermatologist
before trying out any creams.
Hope it helps,
Dr Geetika Paul.