They do not contain hormones. They are taken during the fourth week, including during menstruation. The pills are taken for three weeks. No reminder pills are taken during the fourth week, when menstruation usually occurs. A new pack of pills is started seven days after the last pack is completed.
Menstruation usually occurs during the fourth week, no matter which series is used.
Be sure to follow the instructions on the package. Your clinician will explain how to use your pill pack. You will also be advised whether you should start on a Sunday or on the first day of your period. Taking the Pill at the same time each day makes it more effective. It also helps you remember to stay on schedule.