The "morning after pill" has been denied to many women, most recently in the United States, as an over-the-counter emergency contraception method. In a pinch, some kinds of birth control pill can be used:
http://ec.princeton.edu/questions/ecother.html
Also, again in the USA, women can go to a Planned Parenthood clinic to receive a prescription for the morning-after pill, and you can get the prescription filled there as well in many cases.
Of course, prevention is so much better than cure, so be careful out there. Condoms help prevent disease, but they are not 100% effective for birth control, so women should use an additional method.
http://ec.princeton.edu/questions/ecother.html
Also, again in the USA, women can go to a Planned Parenthood clinic to receive a prescription for the morning-after pill, and you can get the prescription filled there as well in many cases.
Of course, prevention is so much better than cure, so be careful out there. Condoms help prevent disease, but they are not 100% effective for birth control, so women should use an additional method.