Standard: Ovulation = Cycle Day (Length − 14)
Fertile Window: Ovulation − 5 to +1 day
Ovulation Predictor 2025: Find Your Fertile Window & Best Days to Conceive
Ovulation is when the egg is released — **24-hour window** to conceive. Our predictor shows **6-day fertile window** (sperm survives 5 days).
How Ovulation Works
| Phase | Days | Hormones |
|---|---|---|
| Menstrual | 1–5 | FSH rises |
| Follicular | 1–13 | Estrogen grows follicle |
| Ovulation | ~14 | LH surge |
| Luteal | 15–28 | Progesterone |
Fertile Window Explained
- Day −5 to −1: Sperm waits in fallopian tube
- Day 0: Ovulation — peak fertility
- Day +1: Egg viable 12–24 hrs
- Intercourse **every 2 days** in window = 25–30% chance/month
Signs of Ovulation
- Cervical mucus: clear, stretchy (egg white)
- Basal body temp: 0.5°F rise after ovulation
- Mild pelvic pain (mittelschmerz)
- LH surge on OPK (positive 24–36 hrs before)
Irregular Cycles?
Use **OPKs**, **BBT**, or **cervical mucus**. Calculator estimates from average.
IVF & Medicated Cycles
Ovulation = **trigger shot date + 36 hours**. Enter that date.
Age & Fertility
- 20s: 20–25% chance per cycle
- 30s: 15–20%
- 40+: <5% (use donor eggs if needed)
Boost Conception Odds
- Every other day in fertile window
- Lie down 15 min after sex
- Avoid lubricants (use PreSeed)
- Healthy weight, no smoking
Limitations
- Not 100% accurate for PCOS/irregular
- Does not confirm ovulation
- Use with BBT/OPK for precision
Pro Tips
- Start OPK on cycle day 10
- Track with Conception Date
- Have fun — stress lowers chances
FAQs
Can I ovulate twice? Rare (hyperovulation) — leads to fraternal twins.
What if no period? Could be anovulation — see doctor.
Safe to try after miscarriage? Yes, after one cycle.
Conclusion
Use our **2025 Ovulation Predictor** to time intercourse perfectly. Combine with OPKs for best results.
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