Locked out of everything

Ok, so here is what I did.
I was changing the name of a page that I was in my menu, and I changed the slug as well
When I did that, it seems it “broke” something in WordPress.

Now the entire site is unaccessible, and I can’t even login to the WP admin.
If I try logging it doesn’t give me an error, it just reloads the login box.