Red, splotchy, itchy rash on my belly. 28 weeks.

I haven’t had almost any itchiness with my bump, but today it’s almost unbearable. I haven’t used any new products or scents and haven’t changes anything about my normal routine (scents, laundry detergent, new clothes, etc.) I’ve lathered up with my lotion and the itch is still crazy. Any tips or advice? Thanks!