Taking emergency contraception within 72 hours of unprotected intercourse is your best bet to avoid unwanted pregnancy. The manufacturer of the emergency contraception Next Choice One Dose™ states, “Some women may have spotting or bleeding before their next period. Some women may have a heavier or lighter next period, or a period that is early or late. Most women will have their next menstrual period at the expected time or within a week of the expected time.” The makers of Next Choice One Dose™ recommend having a pregnancy test if your period is more than 1 week late. If you have questions or concerns, talk to your health care provider.