Guides
General, non-diagnostic background on the ideas behind each calculator, written for when you want the explanation, not just the number. None of this is medical advice; see our Terms of Use for the full disclaimer.
Aug 10, 2026
How your due date is actually calculated (and why it's an estimate, not a deadline)
What Naegele's rule actually does, why it assumes a 28-day cycle, and why most babies aren't born on their exact due date.
Aug 14, 2026
Trimesters explained: where each one actually starts and ends
The standard three-trimester division, why week boundaries vary slightly by source, and a general, non-diagnostic overview of each stage.
Aug 17, 2026
Kick counting: what's normal, and when to call your doctor
Why fetal movement counting is commonly recommended, one general method providers cite, and why a noticeable decrease in movement is always worth a prompt call.
Aug 20, 2026
Timing contractions: what the numbers actually mean
What duration and frequency actually measure, a commonly cited general labor pattern, and the general difference between Braxton Hicks and labor contractions.