Changes I Made aren't showing up in Play

So I am working on a project, any changes I make are not showing up in the Play Test. For example, I add a cube, hit play, and the cube isnt there. I have a main menu so I cant tell if the cube just disappears, but it is not there once I hit play game. Just before I noticed this I was working in blueprints, more specifically my HUD, could a blueprint cause this somehow?