I have had my mirena iud since july of 2005. Each month I check the strings to make sure that the iud is still in its proper position. At first I was able to feel both strings easily, but now I only seem to be feeling one. I am pretty sure that they are not stuck together, but I know that this is a possibility. Also, this month the string seems to have shortened significantly, to the point that it is barely sticking out of the cervix. It used to be at least 2 cm. Has anyone else experienced this with the iud? I have heard others say that the string length may change depending on the time in the cycle... Currently I am around mid cycle. I don't really know if this is something to call the doctor about or not because the string technically is not missing. Please let me know what you think.