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What is the “dangerous period”?

May 16, 2022 Source: Cainiu Health
Dr. Chen Zhe
Introduction
The “fertile window” typically occurs around 14 days after the onset of menstruation. Since an ovum remains viable for approximately 1–2 days after ovulation, and sperm can survive in the female reproductive tract for about 2–3 days, the 4–5 days surrounding ovulation (i.e., the days immediately before and after ovulation) constitute the period of highest conception risk—termed the “fertile window.” This contrasts with the “safe period”; all other times outside the fertile window are considered the safe period.

Some women do not plan to become pregnant and therefore pay close attention to the “fertile window”—the period during which conception is most likely—and wish to learn more about it. So, what exactly is the fertile window?

What Is the Fertile Window?

The fertile window typically occurs approximately 14 days after the onset of menstruation. Since an ovum remains viable for about 1–2 days after ovulation, and sperm can survive in the female reproductive tract for 2–3 days, the 4–5 days before and after ovulation constitute the period of highest fertility—termed the “fertile window.” This contrasts with the “safe period,” defined as all other times outside the fertile window.

Women can preliminarily identify their fertile window using methods such as basal body temperature tracking, calendar-based calculations, or cervical mucus observation. The most commonly used method is the calendar (rhythm) method. For example, in women with regular menstrual cycles of 28–30 days and consistent sexual activity, ovulation generally occurs midway between two consecutive menstrual periods—i.e., around day 14 of the cycle (counting from the first day of the last menstrual period). Thus, the fertile window spans approximately 4–5 days before and after this day. However, ovulation may be delayed—or occur earlier—due to factors such as emotional stress, health status, or environmental changes, potentially leading to unexpected ovulation. Consequently, this natural family planning method offers relatively low contraceptive reliability.

If a couple requires contraception over an extended period, they should opt for more reliable contraceptive methods—for instance, male condoms or intrauterine devices (IUDs) for women. We hope this information has been helpful!

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