Question 1

What is the fertile window?

Accepted Answer

The fertile window is the 6-day span when pregnancy is most likely: the 5 days before ovulation plus ovulation day. Sperm can live up to 5 days, while the egg lives only 12-24 hours after ovulation.

Question 2

When am I most fertile?

Accepted Answer

You're most fertile in the 2 days before ovulation and on ovulation day itself. Conception probability per cycle is highest on the day before ovulation (33%) and ovulation day (33%).

Question 3

How do I calculate my fertile days?

Accepted Answer

Enter the first day of your last period and your average cycle length. This tool calculates your ovulation day (approximately 14 days before your next period) and the 5 days leading up to it — your fertile window.

Question 4

Is the fertility calendar reliable?

Accepted Answer

Calendar-based fertility tracking has a 12-24% failure rate for contraception. For pregnancy planning, it's a useful starting point. For maximum accuracy, combine calendar tracking with BBT charting or ovulation predictor kits.

Question 5

How many months in advance can I predict fertility?

Accepted Answer

Calendar-based fertility calculations can project 3 months forward, but accuracy decreases beyond the next cycle. For longer-term fertility tracking, AI-based apps like Cyra adapt to your changing cycle patterns.

Your Best Days to Conceive

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