Please answer?? what could it be...?

ok. i'm fourteen. and what i'm about to write please don't make rude comments about. since the fourteenth of last month i have had unprotected , using the pull out method about seven times. i have headaches, nausea, back pain, my are really sore, i'm extremely hungry at weird times, i am so aggrivated at stupid things, i've gained some weight, my stomach is crampy feeling, and i am four days late. i know it sounds obvious but do you think i could be preg or what are my chances?