I loaded a new scene and my other scene got deleted,I opened a new scene and Unity deleted my other scene!

I was working on a scene then I opened a new scene from the assets tab, then the scene I was working on disappeared. Help!,I had 1 scene open and was working on it. Then I opened a new scene from the assets tab and my other scene has gone. How do I get it back?

Does the scenes have the same name?
It’s very important in Unity that you have no “Nametwins”.