Ako vypočítať Fertility Window
Čo je Fertility Window?
The fertility window is the 6-day period when conception is possible — 5 days before ovulation and ovulation day itself. Ovulation typically occurs 14 days before the next period.
Vzorec
- CycleLength
- Menstrual cycle length (Days (typical 28, range 21–35))
- OvulationDay
- Expected ovulation (Days from cycle start)
- FertileWindow
- Peak fertility window (Days (5–6 day window))
Sprievodca krok za krokom
- 1Ovulation ≈ Cycle length − 14 days from LMP
- 2Fertile window = Ovulation − 5 days to Ovulation day
- 3Sperm survive 3–5 days; egg survives ~12–24 hours
- 4OPK tests and basal body temperature confirm ovulation
Worked Examples
Frequently Asked Questions
How do I predict ovulation?
Calendar method: ovulation = cycle length − 14 days (average). LH surge kits detect surge 24–36 hrs before ovulation (most accurate). Basal body temperature rise (0.5°C) confirms ovulation post-hoc.
Does cycle length variation matter?
Yes. 28-day cycles: simple prediction. 21–35 days normal but unpredictable. Track 3 months minimum to establish pattern. Apps (Clue, Flo) help predict best.
What decreases conception chances?
Irregular cycles, anovulation (no ovulation), poor egg/sperm quality, timing (intercourse every 2–3 days throughout cycle > precise timing), age (female fertility drops 35+).
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