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.
It depends on when you start taking them. You can take your first birth control pill any day of the month, but you may need a backup birth control method (like condoms) for the first 7 days. If you start combination pills within 5 days after your period starts, you'll be protected from pregnancy right away.