Thanks for the query, it could be pregnancy
rashes called scientifically as PEMPHIGOID
GESTATONIS, they are seen during pregnancy and then disappears. They are benign and do not pose any poblem to the fetus nor the mother. Just apply some CALAMINE
lotion, it will be alright. If persist consult your gynaecologist or a Dermatologist
Hope I answered your question, Kindly reply me if you have any further queries or any comments. I will be very happy to help you.