Plan B is one brand of the emergency contraceptive levonorgestrel, which works by delaying ovulation. It is sold over the counter at pharmacies, but is often kept in locked boxes or is only accessible by asking a pharmacist. Justin Sullivan/Getty Images hide caption
Saint Luke's Hospital in Kansas City, Mo., stopped providing emergency contraceptives due to the state's abortion ban, then reversed course. Carlos Moreno/KCUR hide caption
How many guys know about Plan B? Photo illustration by Scott Olson/Getty Images hide caption
Levonorgestrel, one of the main ingredients in emergency contraceptive pills, including Plan B, was found in a recent study to be less effective in overweight and obese women. Justin Sullivan/Getty Images hide caption
The Plan B One-Step morning-after pill will now be available to women as young as 15 without a prescription, and will have another three years of protection from generic competition. AP hide caption
Almost half of all pregnancies in the U.S. are unintended. Rudyanto Wijaya/iStockphoto.com hide caption
Protesters picket in front of the Jacob K. Javits Federal Building in New York City in 2006 for the removal of an age limit on the morning-after pill. Bloomberg/Bloomberg via Getty Images hide caption
Plan B One-Step might be the only emergency contraceptive available to all ages without a prescription. ASSOCIATED PRESS hide caption
A federal judge has ordered the Food and Drug Administration to make all levonorgestrel-based emergency contraceptives available to younger teens without a prescription. Scott Olson/Getty Images hide caption
Plan B is one of two emergency contraceptives available in the U.S. UPI/Landov hide caption
The Plan B pill, one version of the morning-after pill, is available without a prescription, except for women 17 and younger. Joe Raedle/Getty Images hide caption
House Speaker John Boehner, R-Ohio, at the Capitol on Wednesday. Mark Wilson/Getty Images hide caption
With the presidential election decided, doctors and some advocates are calling for the administration to relax restrictions on the sale of Plan B to teens. AP hide caption
Plan B is available over the counter for people 17 and older. AP hide caption
Teenagers won't be able to the emergency contraceptive Plan B One-Step without a prescription. AP hide caption