First period after Mirena

Kelli • .
I got the Mirena put in at 10 weeks postpartum and did not have a period in those 10 weeks. I spotted for 2 days after insertion, nothing for 5 days after. Then 7 days after I started what is I assume my period. But I'm now on day 17 of this period. Is this normal? How long was your first period with the Mirena?