Loading icon has been on my home screen for two days?

(iPhone 5) I don't know why it's there. It only shows up when I'm on the home screen and it goes away when I'm in an app.
(There's a pixel requirement w the photo so there's a lot of unnecessary things in it)
But it's at the top, as usual, next to the carrier. I don't know I just want it to go away bc it's very annoying.

Its most likely a app running in the background. If you double tap the Home button, A bunch of screens should come up. If you swipe up on every screen, It'll close the app. That should make the symbol go away