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Pregnancy & Fertility

12 articles in this pillar.

Pregnancy & Fertility

How Your Due Date Is Calculated (and Why It's an Estimate)

Four methods, one number, and a wide range of normal. What Naegele's rule assumes, why ultrasound usually wins, and what the date actually means.

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Pregnancy & Fertility

Ovulation and the Fertile Window: How to Time Conception

Why the fertile window is six days rather than one, where the day-14 assumption goes wrong, and what tracking methods actually tell you.

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Pregnancy & Fertility

Pregnancy Weight Gain: What's Recommended and Why It's a Range

The Institute of Medicine ranges by pre-pregnancy BMI, where the weight actually goes, and why the trajectory matters more than the total.

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Pregnancy & Fertility

First Trimester Timeline: What's Happening Week by Week

The first thirteen weeks in outline — development, symptoms, appointments, and what's worth calling about.

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Pregnancy & Fertility

Understanding Your Cycle Length: What's Normal and What's Not

What counts as a normal cycle, why the two phases behave differently, and which irregularities are worth investigating.

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Pregnancy & Fertility

Due Date Accuracy by Method: LMP vs. Ultrasound vs. IVF

Four ways to date a pregnancy, accurate to anywhere from one day to two weeks. Which one your date came from tells you how much to trust it — and what happens when two of them disagree.

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Pregnancy & Fertility

Pregnancy Week by Week: What Each Trimester Actually Means

Why week 1 happens before you're pregnant, where the trimester boundaries really fall, and what the numbers in a week-by-week chart are actually measuring.

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Pregnancy & Fertility

Conception vs. Implantation: What the Calculators Assume

Three separate events happen over about two weeks, and they get conflated constantly. Knowing which is which explains why early tests come back negative on real pregnancies.

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Pregnancy & Fertility

How to Predict Your Next Period Accurately (and Why Apps Disagree)

Cycle prediction is simple arithmetic on a number most people measure wrong. How to count a cycle properly, how far ahead the maths holds up, and why two apps give you two different dates.

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Pregnancy & Fertility

How Far Along Am I? Reading Pregnancy Dates Without the Confusion

Why you were two weeks pregnant before you conceived, what '8w 4d' means, which dating method actually wins, and why your app and your midwife disagree by one week.

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Pregnancy & Fertility

The Four Phases of the Menstrual Cycle, Explained Properly

What each phase is actually doing, why only one of them varies in length, and what 'regular' means clinically — which is not 28 days.

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Pregnancy & Fertility

hCG Levels in Early Pregnancy: What the Numbers Do and Don't Mean

Why 'doubles every 48 hours' is only half true, why the 66% rule is out of date, and why a single hCG value tells you almost nothing.

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