Can't feel Mirena strings.

...Pretty much just what the subject says. I checked tonight, as my once a month check....and I cannot feel my strings. But I did notice that my cervix was super soft.. I googled whether or not the cervix elongates when its soft, but I only found information regarding pregnant women and their cervix's... I know i should probably make a dr appt but just wanted to know if anyone had ever had the same issue and what the outcome was. This is my 2nd Mirena and have had no issues with either thus far. Hopefully i'm just overreacting.