I am a health care professional =)
Hopefully will stop sooner rather than later for you.
Mirena has a 3-6 month adjustment time, which includes irregular bleeding and spotting, to EVERY DAY bleeding like you have.
Realistically, it could last 3 months, which is actually normal.
A little trick.. Ibuprofen reduces bleeding associated with IUD's. 600mg every 6-8 hours does the trick.