hi i found this nice piece of info that may help. missed menstrual periods. about 2 out of 10 women stop having periods after 1 year of mirena use. your periods come back when mirena is removed. if you do not have a period for 6 weeks during mirena use contact your healthcare provider to rule out pregnancy. its from this site <link> hope this helps you. good luck
i have a 10 year merana iud i havent a period in 6 yrs im bleeding heavy clots with cramps back pain. i havent had sex in weeks could i be pregnant