How do emergency contraceptives prevent pregnancy?
By preventing ovulation
By preventing fertilization
By inhibiting implantation of a fertilized egg
All of the above
1) Preventing ovulation: Emergency contraceptives can prevent the release of an egg from the ovaries, which is necessary for fertilization to occur.
2) Preventing fertilization: Emergency contraceptives can also prevent sperm from fertilizing an egg by thickening cervical mucus or changing the lining of the uterus to make it less hospitable to sperm.
3) Inhibiting implantation of a fertilized egg: In some cases, emergency contraceptives may also prevent a fertilized egg from implanting in the uterus, which is necessary for pregnancy to occur are not 100% effective.