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 start the progestogen-only pill at any time in your menstrual cycle. If you start it on day one of your menstrual cycle (the first day of your period) it will work straight away and you will be protected against pregnancy. The progestogen-only pill can be used by women who can't use contraception that contains oestrogen â for example, because they have high blood pressure, previous blood clots or are overweight. 2  You can take the progestogen-only pill if you're over 35 and you smoke.