hi..i am a 18 year old girl.who has been on the deprovera injection for over five years.i finally got my periods a year later when i cam off the injection.after two months i went back onto the two month injection throughout these two years i have been on and off the injection and have being having my periods randomly..sometimes missing two months and then gettng them.i last got my period end of october 2010 and had unprotected sexual intercourse. From then and now..i have not had my period..as well as the secons time i had intercourse i had taking taken the morning after pill. i have taken two pregnancy tests and they stat negative.its being almost three months and im still not sure if im pregnant..or could it be somethings else. As my father is diabetic and i and a bit overweight as i like alot of sugar.