What Causes Missed Periods After Coming Off From Depo Shot?

Hi, may I answer your health queries right now ? Please type your query here...

yes, i am a 22 year old mom of 1. i was on the depo shot for about 6 months and, i have been of for about a 1year and 3 months now. i was having a period on up unitl may of this year and now i suddnetly stop i havent had one since. i took a preg. test in june and in july they said negative. i havent had any changes except for now i get head huts some times but othe then that now changes realy, could i be pregnant. i tried to make a doctors apontment but they cant see me until nov.