Unfortunately, it is common to experience irregular staining or bleeding for up to six months after the insertion of the Mirena as your body adjusts to the IUD and the hormones it secretes. However, once the adjustment period is over, it is common to experience very light periods or even no periods at all.
While some women are able to avoid becoming niddah with the initial staining, other women may experience an actual flow which renders them niddah. However, there are leniencies available (such as reducing the number of bedikot, etc.) that may help a woman immerse despite continued staining. It is important to review the laws of stains, since not all staining will render a woman niddah or invalidate the clean days.
Given your reluctance to go back to the copper IUD or take birth control pills (although it is important to note that the Mirena also is a hormonal method of birth control, so you may wish to reconsider about pills), we recommend giving the Mirena a few more weeks to see how you adjust before deciding to have it removed. You can try natural remedies for reducing the bleeding (such as lemon juice, alfalfa, etc.) or speak to your doctor about medication to reduce bleeding such as ibuprofen, bioflavanoids or even a short course of supplementary hormones. You should also be in touch with us or your local halachic authority about halachic leniencies that could help you to complete the clean days and get to mikveh.
If you are not willing to give the Mirena some more time, then you should have it removed. You can discuss with your doctor the possiblity of using a diaphragm. When used properly with spermicide it is highly effective and doesn’t have any of the side effects of IUDs or hormonal birth control.
Please feel free to get back to us with any further questions.
B’hatzlacha!