[rmichaelj]

All Oral Contraceptives work by three methods. By:
1. Preventing Ovulation
2. Preventing fertilization (by inhibiting movement of the sperm to the fallopian tube.
3. By preventing an embryo from implanting into the uterus.

#3 is effectively a chemical abortion.

[ClintonBeGone]

3. By preventing an embryo from implanting into the uterus.

Which of the contraceptives mentioned in this article fall into the third category?