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Ovulation Calculator
Predict fertile window & ovulation date
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Understanding Your Cycle
Ovulation typically occurs 12-16 days before your next period starts (average is 14 days).
Fertile Window spans 5 days before ovulation to 1 day after, when pregnancy is possible.
Most Fertile days are the 2-3 days before and including ovulation day.
Tips for Tracking
- • Track several cycles to determine your average cycle length
- • Basal body temperature rises slightly after ovulation
- • Cervical mucus becomes clear and stretchy near ovulation
- • Ovulation predictor kits can confirm your fertile window
- • Stress and illness can affect ovulation timing
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How to Use This Calculator
Enter your values above to get instant results.
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