Pregnancy Timeline
🎯
Estimated Due Date
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Calculated via Naegele’s rule (adjusted).
🗓️
Gestational Age Today
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Trimester status
⏳
Countdown
—
Days remaining
🌸
Fertile Window
—
Ovulation estimate
End of 1st Trimester
—
13 weeks
Common time for first trimester screening.
Anatomy Scan Window
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18–22 weeks
Detailed ultrasound to assess growth & anatomy.
Viability Benchmark
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24 weeks
Survival outside womb improves; NICU support required.
Third Trimester
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27 weeks
More frequent prenatal visits recommended.
📖 How to Use
Pick your calculation mode, enter the primary date, and adjust cycle length or embryo stage if applicable. Add ultrasound data to align with medical scans. Results update instantly, showing due date targets, trimester checkpoints, and fertility insights.
🧮 Formula Reference
Naegele’s Rule: EDD = LMP + 280 days. Adjust by (cycle length − 28).
Conception Based: EDD = Conception + 266 days.
IVF Transfer: Day 3 → Transfer + 263 days, Day 5 → Transfer + 261 days.
Gestational Age: Current date − reference date.
Fertile Window: LMP + cycle − 14 ± 5 days (historical estimate).
💡 Tips
- Use hospital-provided due dates if ultrasound dating differs more than 7–10 days.
- Ovulation assumptions vary; charted BBT/ovulation kits yield more precise history.
- Schedule prenatal visits and screenings based on provider guidance.
- All timelines are educational. Always confirm with licensed healthcare professionals.