Wrong coordinates? Did the world disappear?

I'm using Google Translate.
I moved to the Nether two days ago.
I sometimes move to the Nether, but that day I went to a place I didn't know from the same portal I always use.
Since there was no return portal, I opened the portal from the Nether and aimed at the first respawn point with a compass. I arrived at the respawn point today, but it was a land I didn't know.
I want to go back to the original place.
I hope someone will solve the problem.