I was researching on the "morning after" pill after a friend enquired about the morality of taking this after a non-consensual intercourse took place. From my limited bioethics knowledge, as far as I know, the "morning after" pill almost never prevent conception; because by the 'morning after', it's usually too late. So taking this pill usually resulted in killing what life might have already been conceived. But I was curious...
Doing a Google search, I found a pro-life site morningafterpill.org at the top of the search result. This is an interesting description Google put underneath:
Site asserts that "morning after" emergency contraception is just another abortion approach that kills...
A little technical info: the description below a search result item is normally taken from a Meta tag of the site, or an excerpt (usually the first line) of its main page. Being a pro-life site, there is absolutely NO WAY that site would describe itself in that manner! Conclusion: somebody else put that description for them.
I think this may have to do with Google trying to be PC; after the Amazon.com snafu, where a customer complained that Amazon was being too 'right-wing' when his/her search for items on the subject of abortion, and the alternative suggested keyword returned by Amazon (usually when there is a spelling error/high correlation) was adoption! LOL.
I was initially hesitant to cite from this site, because it is taking data from 1999 and before... Looking up a recent 'morning after' pill product however: Plan B, explains how they prevent pregnancy (note: not prevent conception) in an almost identical language as the site described. So these assumptions still hold.
One page explains that this pill normally contains hormones (as found in birth-control pills) and works in three ways:
1. Ovulation is inhibited, meaning the egg will not be released;
2. The normal menstrual cycle is altered, delaying ovulation; or
3. It can irritate the lining of the uterus so that if the first and second actions fail, and the woman does become pregnant, the human being created will die before he or she can actually attach to the lining of the uterus.
A link from this site goes on to explain a possible case why the pill might just precipitate ovulation, and a host of other conditions, such as altering of the endometrium, which led to the failure of the fertilized ovum to implant. (Read: abortifacient)
Beginning four days before ovulation, the average likelihood of conception from intercourse jumps from 0% to 11%. It rises to 30% on the day preceding, and day of, ovulation, before dropping to 9%, 5% and 0% on the three subsequent days. ... If an ovum is in the Fallopian tube, the process of fertilization may begin within 15 to 30 minutes after intercourse. The 'morning after' is already too late for any contraceptive effect to intervene.
Citations are available at those links. Read it for yourself and marvel how much infanticide has prevailed.