HOW DO I LOAD AN APPS DATA FROM PREVIEW?!?! [URGENT]

I accidentally deleted an Xcode project from my mac, Like emptied the trash and everything and I dont know how to recover it. I opened a new project and previewed and saw the app still in the preview with all the other apps Ive made in the past. How do I transfer the apps data to a new project, this is urgent so please respond with any advice!