The abortion pill ends an early pregnancy. So it will not work if you are already pregnant when you take it.
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With a similar chemical make up as ru 486 and warnings hidden within its own product information there is no question that plan b can terminate a pregnancy.

Is plan b abortion. The international federation of gynecology and obstetrics citing new research declared last march that plan b does not inhibit implantation but instead blocks fertilization. It does not cause a miscarriage or abortion. In other words it does not stop development of a fetus once the fertilized egg implants in the uterus.
So technically speaking using acog s definition of pregnancy plan b does not cause an abortion. Plan b isn t the same as the abortion pill. Plan b is being deceptively marketed as emergency contraception rather than an abortion pill.
In contrast plan b can only be used to help prevent pregnancy if taken within 5 days of sex. Plan b one step is not the same as ru 486 which is an abortion pill. Emergency contraception like plan b decreases your odds of getting pregnant in the first few days after unprotected sex and the abortion pill ends a pregnancy within the first 11 weeks of pregnancy.
For this reason a lot of media outlets are saying that plan b is not an abortion pill or.