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What is the mechanism by which emergency contraception works?

It blocks sperm from entering the uterus

It prevents fertilization or implantation

Emergency contraception primarily works by preventing fertilization or implantation. It usually contains hormones that can delay or inhibit ovulation, thereby reducing the chance of sperm meeting an egg. If ovulation has already occurred, some forms of emergency contraception may also create changes in the endometrium that make it less suitable for a fertilized egg to implant.

This understanding of the mechanism is crucial as it highlights that emergency contraception is not intended to terminate an existing pregnancy, which is often a common misconception. Therefore, options that suggest it blocks sperm or induces abortion are not accurate representations of how emergency contraceptive methods function. While they can also have effects on the female reproductive system, the primary mechanism remains the prevention of fertilization or the potential for implantation.

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It promotes ovulation

It induces abortion

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