Quoting Colton's Mommy ♥:" I started my period 9 days ago, it lasted 7 days (it was pretty light). It took a break yesterday & I ... [snip!] ... light again today. I got my IUD put in on the 23rd of this month. Could this still be my period or a side effect from my IUD?"Most likely your IUD. When I had my IUD inserted I bled for a week, stopped, then had it for 7 months straight!!!! Now I have regular (LONG) but regular bleeding and regular cramping. My periods used to be 3 days, mow they are 8-9. One thing I hate about it, but other then that, i love the Mirena.