My iPhone is saying I have used 4 gigabytes on my photo library yet I have no photos on my phone?

I have an iPhone 6 on iOS 10.2.1. When I go to Settings -> General -> Storage -> Manage Storage my photos app says I have 4.3 gigabytes used in photo library yet I have no photos at all on my iPhone. How do I clear up the phone and get my storage back? I have deleted every single photo I have on my phone to free up space but my phone still says the same thing about using 4.3 gigabytes in my photo library, I do not understand why. Also I have uploaded all of my photos to Google Photots that way I still have my pictures.

Photo stream?