Is it normal to menstruate using the Quarterly Contraceptive?

Hello. I wonder if it is normal to menstruate even using the quarterly contraceptive. I had my son and with 3 months of it I menstruated, then the doctor prescribed me the quarterly contraceptive ... applied day 06/09/2011 since then did not stop my menstruation, I know it is not normal to menstruate so long, so I went to the doctor and she answered me on 10/10/2011 that may be what I had left to clean my gestation womb, but I still feel doubtful ... because my belly is always swollen and menstruous every day (little, but it bothers, I have What a daily absorbing uzar that bothers. Please help me what I do?
Expert answer:

You are not menstruating, this is a relatively common bleeding (side effect) in whoever uses Contracept, it is the most frequent cause of withdrawal, you need to go back to the gynecologist to change your contraceptive and not to apply Contracept any more can last 3 months or more - quarterly injection).

Just as the absence of menstruation is very common with the use of contraceptives.