Emergency Birth Control Free Today

[XIX]

[quote name='The Little Way' post='1136994' date='Dec 6 2006, 09:35 PM']
Just an FYI, it is not true that the morning after pill is useless if you are not yet pregnant. This pill can also prevent conception.
[/quote]
True. It works in three ways:

1) Prevents ovulation.
2) I forget, exactly what this one is...
3) Deteriorates the lining of the uterus so that a newly conceived child can not attach itself to the uterine wall.

If I'm not mistaken, then the pill has two hormones: estrogen and progestin. The former prevents conception, the latter is the abortifacient part. So in other words, a pill without progestin would not be abortifacient. But I'm not 100% if that's true or not.

[Birgitta Noel]

Emergency contraceptives have four possible mechanisms of action:

preventing or delaying ovulation,

preventing sperm capacitation or fertilization,

preventing the transfer of an embryo from the fallopian tube to the uterus,

or preventing implantation of a fertilized egg.

It is the last two mechanisms that aren't acceptable.

As for what hormones are in the pills it depends on the pill, there are various combinations.