Is it possible to become pregnant while using Mirena?

Yes. While the device is intended to increase cervical thickness and prevent sperm from fertilizing eggs, many women have reportedly become pregnant while implanted with Mirena. The device is allegedly prone to migration and embedment; if the device is no longer in its proper location within the uterus, the hormones that it releases will not function in the manner in which they are intended, causing ectopic pregnancies, or pregnancies that occur outside of the uterus. In these cases, women risk losing a Fallopian tube, their baby and possibly their ovary if the zygote continues to develop outside of the uterus.

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