Missing pics on Memory card that I took today

Question

I had about 100 pics on my Camera Memory card today & I had to go & take 3 pics for my job. When I came home & put the Mem card into PC it said something about an error & I schould scan & fix (or similar to that) so I did. NOW , my 3 new pics are gone & quiet a few of my old pics are gone from my memory card!!! HELP as I am 3 hours late with the pics for my job now & I can't take more because it is night now! Can you help me PLEASE?????