my life just keeps gettin better and better

so not only have i begun the daunting task of finals week... but i have also been thrown quite a curve. i spent the evening after work working on phase 3 of my 4 part art final:the tonal charcoal drawing. i am about 90% done when i ask my mom's opinion. i then go to get my graphite reproduction drawing.... only to not find it. i looked in my sketch pad, in my charcoal pad, and in my portfolio. nothing. now, my final presentation is on thursday. i need 4 pieces by thursday and the most complicated one is MIA. i hope that i left it in the classroom and that it is still there. if not. i am FUBAR.