Rash on my belly??s

Nicole🌻 • 19 years old, anxiously awaiting the arrival of my little goddess🌸🌺
Im 12weeks 3days n i went to the beach two days ago n ever since ive had this rash on the top of my belly below my boobs, I tried to take a picture of it but its not very good, it itches n my sister said it was because of the sand but i never had sand on my stomach, only legs n hands. So what could be causing this?