The chances of getting pregnant while using a copper intrauterine device and taking the morning-after pill directly are low. These methods are effective in preventing pregnancy, although not 100% guaranteed. It is normal for your period to be delayed by a day. Traveling can also impact your menstrual cycle and cause a delay in your period. Hormonal emergency contraception can cause a delay in periods by a few days. A change in schedule or time difference can also disrupt the menstrual cycle in some people.