mirena iud and restarting period?

Paige
So I've only had my mirena in for about a month. I switch from a Skyla to a mirena and I got my period last week and it ended at six days which was Sunday but today it's like I started my period again, it's not heavy but the blood is bright red. Any thoughts? I felt my strings too and I can feel them without anything hard poking out of my cervix.