Backup contraception after insertion of Mirena within 7 days after menstrual bleeding started: is backup contraception needed?

Backup contraception after insertion of Mirena within 7 days after menstrual bleeding started: is backup contraception needed?

• A. Yes, backup is required for 7 days
• B. No backup contraception is needed
• C. Backup contraception is needed only if cycles are irregular
• D. Backup contraception is required for 1 month

Answer: (B)

The main idea is that placing Mirena within the first seven days of the menstrual cycle provides immediate contraception. At this point, ovulation has not occurred yet, and the device is effective from insertion. Mirena releases levonorgestrel locally, thickening cervical mucus and thinning the endometrium, which adds to the protective effect right away. Therefore, no backup contraception is needed after insertion during this window. If insertion happens later in the cycle or timing is uncertain, backup contraception for about seven days is recommended until the device is reliably effective in that cycle.

The main idea is that placing Mirena within the first seven days of the menstrual cycle provides immediate contraception. At this point, ovulation has not occurred yet, and the device is effective from insertion. Mirena releases levonorgestrel locally, thickening cervical mucus and thinning the endometrium, which adds to the protective effect right away. Therefore, no backup contraception is needed after insertion during this window. If insertion happens later in the cycle or timing is uncertain, backup contraception for about seven days is recommended until the device is reliably effective in that cycle.