I had the Mirena put in 8 weeks after my emergency c-section and on the day I was due to have it put in I started my period, however it was extremely light and lasted two days. Since then I haven't had a period. This was 11 weeks ago, I have very light bleeding quite a lot, randomly and also the next day after sex sometimes although that has died down now and doesn't really happen anymore. It is very light to the point where I have to put tissue in my pants rather than a pad. Why is this? Is it normal? What does it mean?