I got a Mirena in 2 months ago. I have had unusual bleeding off and on that whole time. I had a regular period when I was expecting it last month. 2 weeks after that period, I had heavy bleeding for only a day. Immediately after that I started to have black or very dark brown blood that was light but significantly more than just spotting. This has been going on consistently for the last 7 days. Is this normal? Does this fit under the category of usual bleeding? Or is it a sign of something else?