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.
How long it takes birth control to become effective depends on WHEN during your cycle you take the first pill. If you take the first pill on the first day of your period (as soon as you start bleeding) you are protected right away. If you take your first pill any other time, you will be protected after taking 7 pills. If you miss any pills or take them late during that 7 days you have to start the count over.