i think that happens when you miss pills or take double doses. iv read other responses for other posts
Hey I'm 22 and just started Ortho Lo about a month and a half ago. I don't know how long you have been on it, but my first period on the pill didn't start until 5 days after I started the green "Reminder Pills." I used to take the pill when I was a teenager and I know if you miss your pill 3 days (or 4 I'm not sure) you will go ahead and have your period, no matter what time of the month, so be sure not to miss that many!