before i had the mirena in i was bleeding for 3 months straight. after i had it in i bled for a month but i had a infection of the womb. (i had a d&c, cam and biopsy taken). it settled down pretty much after the 1st month or so for me. it was great iv got to admit (got it out to ttc). id say give it another couple of weeks and if it hasn't stopped speak to your gynae.
its not fun at all. xox