1. What is the Fertile Window?

The fertile window refers to the days in a woman's menstrual cycle when pregnancy is possible. This includes the 5 days before ovulation and the day of ovulation itself, as sperm can survive in the female reproductive tract for up to 5 days.

2. How Does the Calculator Work?

The calculator uses the fertile window formula:

Where:

• \( \text{Ovulation Day} \) — Day of ovulation in menstrual cycle (typically day 14 in 28-day cycle)
• \( \pm 5 \text{ days} \) — 5 days before and including ovulation day

Explanation: The calculation estimates the most fertile period around ovulation when conception probability is highest.

3. Importance of Fertile Window Calculation

Details: Identifying the fertile window is crucial for couples trying to conceive, as it represents the optimal time for intercourse to achieve pregnancy. It also helps in natural family planning methods.

4. Using the Calculator

Tips: Enter your estimated ovulation day (typically day 14 for regular 28-day cycles). The calculator will show your 6-day fertile window. All values must be valid (1-35 days).

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This provides an estimate based on average cycles. Individual variations in cycle length and ovulation timing can affect accuracy.

Q2: What if my cycle is irregular?
A: For irregular cycles, tracking basal body temperature, cervical mucus, or using ovulation predictor kits can provide more accurate ovulation timing.

Q3: How long does the fertile window last?
A: The fertile window typically lasts 6 days - the 5 days before ovulation and the day of ovulation itself.

Q4: Can I get pregnant outside the fertile window?
A: Pregnancy is unlikely outside the fertile window, as the egg only survives 12-24 hours after ovulation and sperm survival is limited.

Q5: What affects ovulation timing?
A: Stress, illness, travel, weight changes, and certain medications can affect ovulation timing and cycle regularity.