I've had a mirena IUD since July of 2013 and have always been able to easily find the strings until today. I usually check them once a month or so and today is the first time I haven't been able to feel them and I'm kind of freaking out! I called my OB and the nurse I spoke to said the strings probably softened, making them difficult to feel. I think it's strange they would all of a sudden soften after having it for over a year, so i went ahead and made an appointment to see my OB next week to get checked out. Until then, does anyone have any experience with this? Everything I've googled sounds pretty scary and I'm trying not to freak out.