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.
If a combination birth control (estrogen and progestin 21- or 28 day birth control pill pack) is started for the first time on the Sunday after your period begins, your period should occur about 25 days later. Ask your healthcare provider which day is the best to start your specific pill pack.