URGENT!DRAWING CAN'T BE SEEN EVEN I CAN SEE IT IN THE TRUMBNAIL..

Hi I have a very urgent problem I AM USING AutoCAD 2015. I have finished my drawing and saved it in 2015 in Student Version . After I tried to open the drawing and but even i could see my drawings on the file thumbnail and as preview but I CANT SEE MY DRAWING WHEN I OPEN DWG FILE AND THE VIEWPORT LOOKS EMPTY BUT NOT IN THE THUMBNAIL.HOW CAN I FIND MY DRAWING .WHAT IS THE PROBLEM?. THIS IS VERY URGENT PLEASE HELP ASAP!!

THANK YOU VERY MUCH 

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