"i was on the shot for almost a year in october i went to my doctor today for my shot i am still bleeding i bled for a week straight i want to stop bleeding i had blood clots for 3 days the blot clots stopped now i am bleeding heavy before my shot my doctor said the lining of your    uterus sheds that is why i was bleeding i know that when i am on the birth control needle it takes a week to work i hope that the bleeding will finally end so i can stop using pads."