Whoa, hold up. Let's set a few things straight.
The "morning-after" pill is birth control that you can take after sex. It's also called emergency contraception (EC). It doesn't cause an abortion and it won't have any effect if you are already pregnant.
The FDA made it available for sale without a prescription after years of review. It is extremely safe and effective.
If you or any of your friends ever have a birth-control emergency, please consider EC. It's a second chance to prevent unintended pregnancy.