Thank you for reaching out to us.
Though
Mirena can provide effective contraception for much longer, its hormonal effects tend to wane at around the five-year mark. If you find that the spotting continues and is disruptive, then you may wish to consult your physician about whether you should replace the Mirena.
We view staining such as you describe on a
disposable pantyliner as a stain on a surface not susceptible to ritual impurity, and thus as not making a woman
niddah.
This is the case even if the staining continues for days and even if this happens on a roughly monthly basis. Learn more
here.
Please be in touch with any further questions.