Thanks for the query.
After stopping the depo injection it will take some time for regularization of the periods.
The period can vary from person to person.
If you are continuing the pill that can be one cause for amenorrhea
So you once consult gynecologist get examined and go for ultrasound
By this the possible cause for your problem can be identified and treatment can be given.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429