The information you give is not enough, so I am not sure whether your pictures will be retrieved.
If you did not take any new pictures with your camera, then there is still hope, all you need is a kind of data recovery software
. you can easily recover the deleted pictures with only a few clicks. BTW, this is a freeware and is simple.
But if the deleted pictures is rewritten, i am afraid there will be little hope to recover them.