Mac Forums

I usually use my sd memory card from my camera to upload pictures on my new macbookpro. last time i just inserted it inside the slot, it uploaded all my pictures directly onto the mac.. and deleted the pictures on the camera. But today, i inserted in my sd card and all my new pictures are missing and no where to be found on the mac or the camera itself! instead wat is uploaded on the sd memory card is my old pics from my cannon and nikon camera combined. why did this happen??? can someone help me please!. i would really like to retrieve my pictures back!