Iud strings gone

Lee

So I got my iud when I was like 15 like 4 years ago okay and within like a month the strings disappeared and I called them about it they said it moves around during different times of the month so I shouldn’t worry but is it bad that I still cannot feel the strings at all?? And my cervix is kinda low like I know where they should be and what they feel like but they’re not there no more