You my have lost a post that was in draft or a previously published one. Fortunately, in both cases you can still recover or retrieve the post that was deleted unintentionally. There are several ways to do so:
Recovering a Post in draft / Unpublished:
If your post was in draft and got deleted, you need to find its URL:
Once you’ve found, you are most likely to retrieve it.
Download now (quick server)
Recovering a published post:
If your post was published earlier, you have two places to look for:
All popular search engines maintain the cache of indexed pages. To access the cache of your blog, enter the following and click the cache button right next to the results.
If your blog publishes feeds, subscribe to your own feeds using Google Reader (google.com/reader) or any other similar feed readers and recover your post.