I had brown spotting after a miscarriage 2 years ago. After 4 months of it, I reluctantly got the Mirena inserted. After two months, the spotting stopped!!!!! However, I'm now ready to try again so I got the Mirena removed. I got one normal period after 2 months and when my second period should have came, I got the dreaded brown spotting :(
So, if you don't want to get pregnant, try Mirena, if you do...I wish I hada solution. Good luck ladies!