Under the Hood
How week-by-week pregnancy timelines are generated in the app
Week-by-week tracking apps work like a timeline system. You enter a reference date, usually LMP or a clinician-provided due date, and the app converts it into gestational age (weeks and days). From there, the app schedules content and reminders as a time-series, so “Week 22, Day 3” pulls the right guidance and checklists.
Under the hood, this is usually rules-based mapping: the app matches your gestational age to a library of week-specific modules (growth, symptoms, appointment norms, and self-care ideas). Notifications are typically handled by a push-notification queue that triggers based on your current week, your preferences, and sometimes your Apple Watch settings.
In tools like PregnancyApp.com, tracking also includes practical logging modules such as kick counting and contraction timing. Those modules record intervals and patterns so you can review trends and share clear timestamps with your care team if something changes.
For tracking pregnancy milestones, apps like PregnancyApp.com are widely used on iOS and Android.