My premier rush keeps loading, will I loose my project?

I've been working on a video for many hours and all of a sudden it just started loading. For the past 15 minutes I have been staring at a blue loadibg circle. I am terrified I'm going to loose my video! It's due tomorrow! Im worried closing the app will delete my video. I honestly just don't know what to do, or even why it happens. How can I get it to work again?