What Is The Possible Reason Of Rejection Of Copper T By Body?

hi my wife inserted copper t on november 2010, after her first delivery(was on 24/06/10) after inserting copper t she is experiencing irregular periods and heavy blood flow during menustration. today the copper t is came out with menustral bleeding. what is the complications and possible reasons for rejection(she was on dicynone and cyclo3forte treatment this month)