I had sexual interact with my partner on November 13 and then I had my period last month November 17 it lasted for five days. When the month ended I was spotting on December 5 through December 7 then it ended. Know I was suppose to have my period today December 15th but I don't have it. What can it be ? Because I am still craving for food for the past week im always feeling tired and im always feeling like I want ro throw up but I don't. I am only 16 years old.