everything i made on my world disappeared :(

so i had made a house and exploded a part of the world and i turned off my phone for i'd say about ten minutes or so and i come back and i get back into the world and everything is gone, but not like it didn't happen, i still have the stuff i used to make the things in my inventory but before i went back into the world i changed the world name, i have no clue if that would have something to do with this but other than turning off my phone and changing the name of the world i don't know what might have caused this and now i have to start over