Actually, you still might be able to get those photos back, even though they've been erased. Try not to take any more pics until you've recovered your photos, take the card out of the camera. This is to reduce the chance of you overwriting some of your "lost" photos. There are many good freeware photo recovery software options that may help you recover your photos.
This article reviews and outlines several of the better ones.
This sounds like the problem may have occurred because you might not have formatted the card in your camera as recommended by the manufacturer. If true, after you've recovered your photos, format the card in your camera using the camera's format feature. This will prevent this from happening again.
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