I could see the images in Aperture.
Susan, what do you see in Aperture's Viewer? Does the image look o.k.? Then you have at least good quality previews, that you could save.
Create a new folder on your Desktop, select all recently imported images in the browser, and drag the images from Aperture's Browser window to that folder on your Desktop. That will save the Preview images as jpegs.
You will not be able to restore the originals from the card, if it already has been formatted, unless you have set Aperture to backup directly on import.
If you ctrl-click your Aperture library and select "Show Library Contents", then open the "Masters" folder - do you see any image files in the most recently added folder for "2013 > February > 4 (the day you imported)"?