well, IUD's can irritate the lining of the uterus making it impossible to implant. Birth control pills and shots make it so that the egg is never released from the follicle to be fertilized. The morning after pill is taken so that the lining is inhospitable to a fertilized egg and in many cases can keep the egg from being released if the woman has not ovulated yet.
As for abortion, my views have changed over the years. I think that too many people chose this option. I have friends who have had abortions, and every one of them still thinks about the child that they chose to terminate.
and so they should-it couldv'e grown up to be one of our scientists, doctors, nurses, politicians and they went to get rid....i would feel bad too-have they ever said they wished they could do things differently?