(first time depo user) , was on depo , had normal cycle but it was lighter/moderate bleeding , 1 month after depo no cycle , 45 days later finally spotting after intercourse with husband , went to doctor negative blood prego test , we have sex unprotected all the time & i have not rediagnosed myself with 3 month depo shot , now cycle spotting is times a month no heavy bleeding very light not sure whats going on with my body could i be pregnant ? now my period came sept . 7 - 14 spotting reoccures sept. 21 today i see no blood