No, the Pill and the Morning-After Pill do NOT cause abortions by anyone’s standards, not even the conservative Christian standard.

They do not work by preventing implantation, but by preventing ovulation/fertilization.  Without fertilization, there can be no conception.

The notion that morning-after pills prevent eggs from implanting stems from the Food and Drug Administration’s decision during the drug-approval process to mention that possibility on the label–despite lack of scientific proof, scientists say, and objections by the manufacturer of Plan B, the pill on the market the longest.

Leading scientists say studies since then provide strong evidence that Plan B does not prevent implantation, and no proof that a newer type of pill, Ella, does. Some abortion opponents said they remain unconvinced….

Experts say implantation was likely placed on the label partly because daily birth control pills, some of which contain Plan B’s active ingredient, appear to alter the endometrium, the lining of the uterus into which fertilized eggs implant. Altering the endometrium has not been proven to interfere with implantation.

But in any case, scientists say that unlike the accumulating doses of daily birth control pills, the one-shot dose in morning-after pills does not have time to affect the uterine lining….

Dr. Trussell of Princeton said that if morning-after pills worked after eggs were fertilized, they would prevent pregnancy better than they do. The pregnancy prevention rates are probably lower than scientists and pill makers originally thought, he said–in some studies as low as 52 percent for Plan B and 62 percent for Ella.

By contrast, scientists say, research suggests that the only other officially approved form of emergency contraception, the copper intrauterine device (also a daily birth control method), can work to prevent pregnancy after an egg has been fertilized. –Pam Belluck, Abortion Qualms on Morning-After Pill May Be Unfounded

Wikipedia (has many additional links, some of which are below)

A page from a text by doctors who promote birth control, describing how the Pill works

From the Archives of Family Medicine

Religious Tolerance site article (formerly titled “Do Contraceptives Induce Abortions?”)

PBS article

Note that if you don’t take the Pill regularly, it won’t protect you from pregnancy.  Which also does not support the idea that it’s an abortifacient.

Fact sheet on contraceptives

Here’s a Lutheran paper on the subject: Birth Control Pills: Contraceptive or Abortifacient?

The following article, from a Catholic health journal, argues that Plan B emergency contraception does not cause abortions, as the Church would understand them, that it does not abort fertilized eggs: Plan B: How it Works: Science shows it is not an abortifacient

Why can’t the FDA fix outdated birth control labels?

What Media Should Know About Hobby Lobby and the Fight for Contraceptive Access

Written probably in 2006; completely rewritten between 2012 and 2014

Index to my theology/church opinion pages:

Page 1:

Tithing 
End Times and Christian Zionism 
God’s Purpose/Supremacy of God Doctrine 
Cat and Dog Theology 
Raising One’s Hands in Worship 
Christian Music 
On the “still, small voice” and Charismatic sign gifts
On church buildings 
The Message Bible 
The Purpose-Driven Life 
The Relevance Doctrine, i.e. Marketing Churches to Seekers 
Republican Party 
Abortion Protests 
Creation 
The idea that God has someone in mind for you 
Literalism in Biblical interpretation
Miscellaneous 

Page 2:

Name it and Claim It Doctrine, Prosperity Doctrine, Faith-Formula Theology, Word-Faith Theology,  Positive Confession Theology, Health and Wealth Gospel, and whatever else they call it
More about Pat Robertson
Dr. Richard Eby and others who claim to have been to Heaven
Women in Marriage/the Church
Spiritual Abuse 
Other Resources 

Page 3:

Why do bad things happen?
Should we criticize our brethren’s artistic or evangelistic attempts?  Or, how should we evangelize, then?
Angels: Is “This Present Darkness” by Frank Peretti a divine revelation or fiction?
Halloween: Not the Devil’s Holiday!
Hell and the Nature of God 
Is Christmas/Easter a Pagan Holiday? 
Is everybody going to Hell except Christians?
How could a loving God who prohibits murder, command the genocide of the Canaanite peoples? 
What about predestination?
Musings on Sin, Salvation and Discipleship 
An Ancient View which is in the Bible, yet new to the west–Uncreated Energies of God

Page 4:

Dialogues
The Didache 
Technical Virginity–i.e., how far should a Christian single go? 
Are Spiritual Marriages “real”?  (also in “Life” section, where it’s more likely to be updated) 
Does the Pill cause abortions, or is that just another weird Internet or extremist right-wing rumor?
What about Missional Churches, Simple Churches, Fluid Churches, Organic Churches, House Churches or Neighborhood Churches?
Is Wine from the Devil–or a Gift from God?
What is Worship? 
Evangelistic Trips to Already Christianized Countries
Fraternities, Sororities, Masonic Lodge 
Was Cassie Bernall a Martyr?
Some Awesome Things heard in the Lamentations Service (Good Friday evening) during Holy Week

Conversion Story

Phariseeism in the Church