"i have been taking previfem/sprintec, for about 5 years, and my periods are very regular. my husband and i also use condoms.  we had a condom break on us recently, and it just so happens that i&#039;d forgotten to take my pill that morning at the normal 12pm hour. so i took it immediately afterwards (around 830pm), and then took plan b, the following morning, just in case. i was right in the middle of my 28 day cycle, and the most fertile, so i was very worried! the side effects i experienced were slim to none. i had some light cramping, and my breasts were sore. i experienced some spotting 11 days later (3 days prior to my normal period start date - which was odd), but my period started as normal."