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.
1 The pill will start working right away for birth control if you start on the first day of your period.  Start your first pack of pills on the Sunday after you start your menstrual period. You should use a backup method of birth control (condoms with spermicide) until you start the pill.