Thanks for the query.
After putting IUD some amount of menstrual disturbances are common.
But as you are having continuous bleeding even after expulsion of the IUD, better to consult gynecologist once and get examined.
Go for coagulation profile once.
After confirming the expulsion of the IUD, take medicines to control the bleeding.
Once your bleeding stops, you can go for some other contraceptive
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429