It is only to be used in emergenicies and should under no circumanstances be used as method of contreceoption.
It is normally used for eg if a condom has split, not merely beacuse you didnt want to use a condom or didnt have one.
Make sure you get regular contrception sorted.
It is definatly not like an abortion.
An abortion is actually removing the already formed embryo/foetus from the womb, wheras the morning after pill is used to prevent you ever falling pregnant.