No one really knows how many changelings were present during the invasion of Canterlot. Unfortunately for the rest of the world, it also means that the love explosion scattered them all over the surface of Equus. These are stories of some of them.
A simple drone "accidentally" failed to leave the Badlands hive for the invasion to Canterlot. He was only two weeks old, one of the clutch specifically created to break through the protective shield. Now starving, he's just trying to survive.
There are thousands of stories about changelings lost and broken after the explosion ending the invasion of Canterlot. After all, there were thousands of changelings caught in it. Some found love or peace, and some found death. I'm just one of many.
A little changeling drone couldn't make it for the big invasion. With the help of other desperate changelings, he avoided pony retribution as long as he could, but in the end, ponies found him. Now alone, he's just trying to survive.