But if the egg has already been implanted in the uterus, the morning-after pill will not work.
Here's what could stimulate demand for the recently approved morning-after pill: an "evening-before" nasal spray--for both him and her.
If the government fails, it would clear the way for over-the-counter sales of the morning-after pill to younger girls.
The morning-after pill contains a higher dose of the female progestin hormone than is in regular birth control pills.
He opposes abortion in all circumstances and has said he also opposes the morning after pill, which he equates to abortion.
They say lowering the age to 15 for purchasers of the morning-after pill makes emergency contraception available for women of all ages.
If a woman already is pregnant, the morning-after pill has no effect.
Overall, about one in five women who had never been married had taken a morning-after pill, compared with just one in 20 married women.
One possibility is a "morning-after pill, " says Helicon Therapeutics' Tim Tully.
Korman's order sparked praise among supporters of the morning-after pill for all ages, such as the Center for Reproductive Rights, which had launched a relevant lawsuit.
Some 11% of sexually active women had used the morning-after pill, up from 4% in 2002, according to the US Centers for Disease Control and Prevention.
Today is the last day for government lawyers to try and stop a New York judge's ruling that would lift age restrictions for buying the morning-after pill.
News of the program's expansion to two new counties comes as the federal government approves the "morning-after pill" without a prescription for girls as young as 15.
Use of the morning-after pill in the US is on the rise, a trend driven largely by wider use among younger women, a major government study has found.
Last summer the health department decreed that all new health-insurance policies should cover birth-control services for women, including the morning-after pill (which most pro-lifers consider a form of abortion) and sterilisation.
Any over-the-counter access marks a long-awaited change, but it's not enough, said Dr. Cora Breuner of the American Academy of Pediatrics, which supports nonprescription sale of the morning-after pill for all ages.
But let some pro-life employers say they oppose having to provide contraceptive coverage including the morning-after pill, which aborts a fertilized egg to their employees and the left throws the First Amendment out the window.
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The FDA was preparing in 2011 to allow over-the-counter sale of the morning-after pill with no agency limits when Health and Human Services Secretary Kathleen Sebelius overruled her own scientists in an unprecedented move.
Social conservatives had opposed any efforts to loosen restrictions on sale of the morning-after pill, arguing that it was important for parents and medical professionals to be involved in such decisions involving young girls.
The Christian right is appalled at Wal-Mart's godless depravity, in particular its decision to sign up with the National Gay and Lesbian Chamber of Commerce in August and (horrors) to stock the totally legal morning-after pill.
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Obama and Health and Human Services Secretary Kathleen Sebelius have also questioned whether there's enough data available to show the morning-after pill is safe and appropriate for younger girls, even though physicians groups insist that it is.
U.S. District Court Judge Edward Korman has said that politics was behind efforts by Secretary of Health and Human Services Kathleen Sebelius to block the unrestricted sale of the Plan B One-Step morning-after pill and its generic competitors.
U.S. District Judge Edward Korman took aim at the U.S. Food and Drug Administration's announcement last week that it was loosening restrictions on the Plan B One-Step morning-after pill, saying it can be sold without a prescription to those 15 and older.
With a more liberal Democratic speaker in place, who is now doing time in federal prison, Romney had no place to hide as hot-button issues such as stem cell research, the morning-after pill and various bills on sexual orientation rights escaped the legislature and made it onto his desk.
The US Food and Drug Administration (FDA) has approved the "morning-after" pill without a prescription for women aged 15 and over.
In 2011, the FDA said it had concluded that the "morning after" pill could be safely used by girls of child-bearing age.
Evangelicals generally permit the use of birth control, but they object to specific methods such as the morning-after contraceptive pill, which they argue is tantamount to abortion.
And also, I'm wondering if you personally intervened in any way in halting the sale of the "morning after" pill to those under 17, and whether you think politics trumps science in this case.
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Fifty years after the contraceptive pill was first licensed in America and 37 years after the Supreme Court legalised abortion, women seem to agonise more than ever about breeding.
Norman Betchley, who had a nil by mouth sign above his bed, choked and died after taking the pill in 2009.
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