1. What Are Fertile Days?

Fertile days refer to the window in a woman's menstrual cycle when pregnancy is most likely to occur. This typically spans 6 days ending on the day of ovulation, with the highest probability in the 3 days before ovulation.

2. How Does the Calculator Work?

The calculator uses the standard fertility calculation formula:

Where:

• \( \text{Ovulation} \) — Typically occurs 14 days before next period
• \( \text{Fertile Fast} \) — 6-day window around ovulation
• \( \pm 3 \text{ days} \) — 3 days before and after ovulation

Explanation: Sperm can survive up to 5 days in the female reproductive tract, while the egg is viable for about 24 hours after ovulation.

3. Importance of Timing

Details: Accurate timing of intercourse during the fertile window significantly increases the chances of conception. The probability is highest in the 2-3 days leading up to ovulation.

4. Using the Calculator

Tips: Enter your average cycle length (21-35 days) and the first day of your last menstrual period. For best results, track your cycles for 3-6 months to establish your average cycle length.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: This provides an estimate based on average cycles. Individual variations in ovulation timing can occur due to stress, illness, or hormonal changes.

Q2: What if my cycles are irregular?
A: For irregular cycles, consider using ovulation predictor kits, tracking basal body temperature, or monitoring cervical mucus changes for more accurate timing.

Q3: How many days before ovulation should we have intercourse?
A: The optimal time is every other day during the 6-day fertile window, with emphasis on the 3 days leading up to ovulation.

Q4: Can I get pregnant outside the fertile window?
A: Pregnancy is unlikely outside the fertile window, though rare cases of very early or late ovulation can occur.

Q5: When should we seek medical help?
A: If you're under 35 and haven't conceived after 12 months of trying, or over 35 after 6 months, consult a fertility specialist.