Well, if you take action as soon as possible, chances of deleted photos recovery from your digital camera is quite possible.
Check this site digital camera recovery
for such programs to take the stress out.
Note: Do NOT try & write anything back untill you can retrieve your files safely! After accidentally deleting files from the camera, do not attempt to copy additional files onto the card before attempting file recovery as this will overwrite the files and make them much more difficult if not impossible to recover.