"i took this pill 19 hours after our condom leaked.  my period had just ended, so we wanted to be cautious.  i took it on jan 4, 5 days later i had some abdominal cramping, a severe headache and cramping.  the bleeding and cramping lasted 4 1/2 days.  i also had some very minor light headedness off on of during january, but i&#039;m not sure if it was really caused by the pill or not.  my next period was very late, i usually have a short cycle, about 25 days since i don&#039;t use birth control pills regularly it&#039;s length is irregular, but mine came a full 7 days after my longest cycle of 28 days.  it started on feb 2.  i did have more cramping the week before it started.  the cramping was not fun, but at least it worked."