If starting COC on the first day of the period (first-day-start) and you begin within 5 days of onset, what backup is required?

• A. No backup needed
• B. 0 days backup
• C. 7 days backup
• D. 14 days backup

Answer: (A)

Starting combined oral contraceptives on the first day of bleeding, or within the first five days of the cycle, provides immediate hormone exposure that suppresses ovulation from the start. Because ovulation is inhibited right away, no backup contraception is required. Backup would be necessary if you started later in the cycle (after day five) or if the pill regimen didn’t provide immediate steady-state hormone levels, in which case you’d use backup for seven days to ensure contraception while the pills take effect. A 14-day backup is not indicated in this scenario.