February 7th, 2011, 07:27 AM
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Platinum Supermommy
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Join Date: Aug 2006
Location: Alberta, Canada
Posts: 10,160
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If the IUD has hormones, the hormones will suppress your signs of fertility (CM and temps). Also there is supposed to be a thick plug that seals off the cervix during the infertile parts of your cycle (to protect the uterus from infection). The IUD strings hang through the cervix and disrupt the plug, so you may notice mucus much of the time that isn't actually related to fertility.
If the IUD has no hormones, you can track your temperatures and possibly even CM. The IUD does cause inflammation to the uterine lining to prevent implantation and this inflammation can also extend to the cervix, causing secretions that are not related to fertility. Hard to tell what's CM and what's related IUD's irritating effect on the cervix and mucus plug.
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