Always possible: Mirena (levonorgestrel) is one of the most effective forms of birth control. Unfortunately, no birth control method, including Mirena (levonorgestrel) or tubal ligation is 100% perfect. Once Mirena (levonorgestrel) is properly placed, it is over 99% effective and works consistently to prevent pregnancy. Some women may experience irregular bleeding after Mirena (levonorgestrel) is placed. Do a pregnancy test if you are worried.
Answered 11/16/2015
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