You are having round skin lesions and they are spreading.
You are pregnant.
It may be fungal or allergic skin disease.
It may be pregnancy dermatosis
It is difficult to say.
You consult dermatologist
for proper diagnosis and treatment.
Without clinical examination, no drug should be given to you.
And selfmedication is also dangerous.
So , consult dermatologist immediately or take an advice of your gynaecologist.
I hope you got my answer.
Dr. Ilyas Patel MD