Mirena question

Tracy • T-9/1992 O-4/1993 Met-12/2011 Dating-9/2012 Married-9/2014 C-1/2015 Living the perfect life of imperfection.
So I got my Mirena in March and everything has been great. No side effects at all. Well I did my monthly check right after my period ended yesterday and the string felt easier to touch than normal but I didn't think too much of it. *Tmi alert*Well tonight my dh and I had dtd and he said something about was the strings being almost at opening. Do I need to call my doctor first thing in the morning? Has this happened to anyone? I'm really confused on what I need to do. Thanks in advance.