Octal - See also. 1  Computer numbering formats. 2  Octal games, a game numbering system used in combinatorial game theory. 3  Syllabic octal, a specific octal representation of 8-bit syllables.
Your doctor or nurse will suggest 1 of the following methods to begin taking the pill: Start your first pack of pills on the first day of your menstrual period. Use a backup method of birth control (such as condoms with spermicide) until you start the pill.
The pill works on a 28-day (4 week) cycle. Your clinician will either prescribe you a pack of 28 pills or a pack of 21 pills. If you have a 28-day pack, you will take one pill with hormones every day at the same time for 21 days (week 1-3).