It is recommended to take a pregnancy test when your next period is overdue. If you are taking the pill, this corresponds to the dates after the week of cessation. Most tests have a very high accuracy rate at this time. However, if you take the test earlier, there is a greater chance of a false negative result. It is important to read the packaging carefully and your pharmacist can help you understand the product and use it correctly. The pill is over 90% effective as a contraceptive. If you are unsure of how you took your contraceptive and/or if you had sexual intercourse within the last 5 days, you can speak to your pharmacist in private to discuss the possibility of taking the morning-after pill.