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.
You can also start taking this pill at any other time in your cycle if your doctor is reasonably sure that you are not pregnant. If you start taking this pill at any other time in your cycle, you will need to use additional contraception, eg condoms for the first two days of pill taking.