The contraceptive (and abortifacients?) affects of the Birth Control Pill include:
- Suppression of ovulation (Although break-through ovulation can and does occur)
- Thickening of cervical mucus to prevent sperm from being transported to the egg
- Interfering with the endometrium’s ability to properly nourish the blastocyst (newly fertilized egg), if it successfully implants in the uterine lining. More discussion regarding the potentially abortifacient nature of this process can be found here and here.