7 months on Mirena Irregular Bleeding

Hi ladies! I'm in love with the idea of my iud but must admit it's been a bumpy ride. I use eve to track my periods, and after the first few months of constant bleeding, they pretty much came on time as eve predicted. Some would be very light and pink/brown, and some would be rather heavy and bright red, lasting about a week. My strings also move around a lot throughout the month (really long at times, almost missing at others).