Itchy belly 😣😖

Nicole • Mommy to ID girls. Harper & Paige born 12/28/15
36 weeks today and I swear I woke up with stretch marks this morning. They weren't there yesterday. So crazy. My belly is so incredibly itchy. It's all I can think about!!! Since the day I found out I was pregnant I've been slathering on oil and Shea 3x daily. It's no longer working. 
Does anyone have remedies for itch? I'd like to stay away from cortisone cream as it can thin the skin. TIA :)