Nothing is 100%: The most common cause of failed hormonal contraception is related to user-error: missed pills, patch, ring, shot, etc, but even if you use a method perfectly, failures can happen. Next to permanent sterilization, the most effective methods include iuds and implants--which are "forgettable"--and not as subject to user-error, making them easy and very effective to use.
Answered 12/13/2016
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