Log into the web version of Wattpad at www.wattpad.com to check if you can see your missing stories in there.
Or
Check in your browser history.
If this does not appear in your history, you can look for it in your activity on your profile.
Take a look in your library. ...
Otherwise, you can search the name of the story.
If you do not remember the name of the story, take a try with the username of its author.