I had my 3rd mirena coil fitted 15th dec 2008. I had my first one removed bacuse we were going to try for a baby, circumstances changed and i had it fitted again. 8 months later it got infected and had to have it removed. after a course of antibiotis and 3 periods i had re fitted (15.12.08). Since the i have been bleeding. Some days im heavy, then the next day im light it changes in colour and consistency to, dark , light, watery, normal period like blood. What can this be? and why?