occurs while being on copper T, there is increased chance for miscarriage
so that may be one reason for your fetal demise, but there may also be other reasons like chromosomal abnormalities,
if that is only because of copper T there is less chance for recurrence in future pregnancies.
but this time when you conceive better follow with regular antenatal checkups from the beginning of the pregnancy,
for more details on copper T you can read my article,