Curses!!

so, me and my friend did a "photo shoot" last weekend, i took pictures of her, she took some of me, outside by the marsh and all. well i worked on some of them but saved them to my memory stick. i haven't looked at them in a few days and just looked on it now to upload some....that won't be happening..somehow, they all got wiped off of my memory stick..there goes a bunch of amazing pictures...gone....
either someone (little sister cough.cough.) is getting on my camera and erasing them, or by some fluke, my camera/memory stick is messing up..this is the second time that has happened.
now i know as soon as i take pictures, load them IMMEDIATELY to my computer..

sigh...
:(