Peer-Reviewed & ACOG Sourced

Evidence-Based Pregnancy Guides

Comprehensive, medically referenced articles detailing pregnancy calculation formulas, gestational milestones, and biological timelines.

Due Dates & Dating 5 min read

How Is My Due Date Calculated?

Discover the mathematics behind Naegele’s Rule, Mittendorf-Williams models, and how obstetricians adjust for cycle length.

Clinical Statistics 6 min read

Why only 4–5% of babies arrive on their exact calculated due date and what clinical studies reveal about the 37–42 week delivery window.

Embryology 4 min read

Understand why gestational age counts the two weeks before conception and how healthcare providers measure development in weeks and days.

Fetal Development 8 min read

A comprehensive clinical overview of fetal organogenesis, viability landmarks, anatomical scans, and maternal physiological changes.

Obstetric History 5 min read

The 200-year history of Franz Naegele’s formula, its modern adaptations, and where ultrasound measurements improve precision.

Conception & Fertility 4 min read

Learn about sperm viability windows, ovulation timing, and how to estimate probable fertilization dates from your due date.

Fertility Science 7 min read

Clinical methods for detecting ovulation—including LH surges, basal body temperature, and cervical mucus—to plan or date conception.

Timeline & Milestones 9 min read

Week-by-week timeline covering heartbeat detection at week 6, anatomy scans at week 20, viability at week 24, and full term at week 39.