Pregnancy Conception Calculator
Estimate conception date, fertile window, and ovulation day based on your cycle
Cycle Information
First day of your last period
Typical range: 21-35 days
Typical range: 12-16 days
Conception Date
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Estimated ovulation day
LMP Date
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Last menstrual period
Due Date
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Estimated delivery
Current Gestational Age
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Weeks pregnant
Fertile Window (Most Likely Conception Days)
Highest fertility: 2 days before to day of ovulation
Conception Probability by Day
* Based on average population studies. Individual fertility varies.
Signs of Ovulation
⬆️ Basal Body Temperature: Sustained temperature rise of 0.4-1.0°F
🥚 Cervical Mucus: Egg-white like, stretchy, clear discharge
💕 Ovulation Pain: Mild cramping on one side (Mittelschmerz)
📈 LH Surge: Detected by ovulation predictor kits
Understanding Your Menstrual Cycle
Menstrual Phase
Days 1-5
Low fertility
Follicular Phase
Days 6-13
Fertility increasing
Ovulation
Day ~14
Peak fertility
Luteal Phase
Days 15-28
Low fertility
💡 A typical 28-day cycle: Ovulation occurs around day 14. Sperm can live up to 5 days, egg survives 12-24 hours.