There is (at least in my mind and many others) an inconsistency in our position statement. I believe that there is considerable evidence that so-called birth control pills (BCPs) do have a significant post-ovulatory (abortifacient) effect. 

Combination pills contain both estrogen and progestins.

Like the Pill it also functions to prevent or end a pregnancy in three ways.

The central issue then is not whether-or-not a woman may experience loss while breastfeeding, horseback riding, jogging, deep-sea diving, or any of the multitude of normative activities of life. 

Here are some sites you might want to visit for alternative birth control methods.

Review of "Does the Birth Control Pill Cause Abortions? by Jed Stuber

Amidst an ongoing debate among prolife advocates about whether to classify the Pill as an abortifacient or a prophylactic, pro-abortion advocates have published an authoritative statement declaring that the Pill prevents implantation of embryos, thereby causing an abortion. 

Christians are increasingly being exposed to the medical and theological debate concerning the potential abortifacient effect of the birth control pill (the Pill).

This resource is available from the Center for Bioethics and Human Dignity: The Pill: Addressing the Scientific and Ethical Questions of the Abortifacient Issue