hellow dr, i am 23yrs old. it z 15months now since i gave birth by operation to my first daughter, i bleeded 50days after the delivery when it stopped i went for a family planning method and i chose to be injected a stick under my left arm which last for two years. since then i have not been menstruating until the day before today when i have been having shomach ache my west and my back are aching as well plus i get very few drops of blood. my questions are, is that a mentruation? if yes why did i stay that long to menstruate? are there any effects in missing my periods? and the pains i get, is it normal?