Thanks for the query.
While being on IUCD, some amount of menstrual irregularity is common.
But as you are having excessive bleeding, better to consult gynecologist once.
With her advice take anti - fibrinolytic drugs to control the bleeding.
Then you can go for additional hormonal
pills for few days, to regularize the cycles.
No need to remove IUCD during this period.
After stopping the pills you can continue with IUCD.