Mirena IUD

Has anyone ever tried the "Mirena" IUD? I had it for over a year; almost 9 months later, I got pregnant but miscarried. Then 2 months after the miscarriage, I got pregnant again but lost it at the same gestational age as the first. Does anyone think there is a factor that can relate the miscarriages to the strain of an IUD? (I had 3 successful pregnancies prior to IUD.)