The women who took EC on the day of ovulation or after became pregnant at the rate that would be expected if they hadn’t used any contraception. This provides compelling evidence that levonorgestrel EC works by inhibiting or delaying ovulation, but is ineffective after ovulation has already occurred (and therefore would not be effective in preventing the implantation of a fertilized egg).
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The women who took EC on the day of ovulation or after became pregnant at the rate that would be expected if they hadn’t used any contraception. This provides compelling evidence that levonorgestrel EC works by inhibiting or delaying ovulation, but is ineffective after ovulation has already occurred (and therefore would not be effective in preventing the implantation of a fertilized egg).
August 16, 2014 - 2:40pmThis Comment
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