My notes disappeared from both my iPad mini and iPhone.

One note from the notes app were deleted from my ipad mini and iphone 4s. I opened up my ipad mini notes app and was looking at the note and all of a sudden it disappeared. I checked other mail accounts and looked on my iphone, but it was also gone from there. My other notes were there but the one i was looking for was gone. I used the search key for it also. Please help!