I've had mirena for almost 4 years with no issues. My periods have always been regular 28-29 day cycles. However, this month (April) I got my first one on the 6th & got surprised today on the 29th. Never in my 25 years of life have I had 2 periods in one month (23 days apart). I also have mild cramps which I never get. Reading Google makes me nervous, so I was hoping someone here could shed some light on this. I'm calling my doctor tomorrow to make an appointment