Pregnancy Tracking in iOS 18 Health App

Apple's iOS 18 introduces comprehensive pregnancy tracking features to the native Health app, allowing expecting parents to monitor their pregnancy alongside their general wellness data. This guide details how the Health app visually presents gestational age and outlines the specific symptom logging tools designed to track physical and emotional changes across every trimester.

How Gestational Age Is Displayed

Once an active pregnancy is logged in the Health app, the Cycle Tracking interface reorganizes to reflect the user's gestational timeline rather than standard menstrual cycle predictions:

  • Weeks and Days Count: The primary Cycle Tracking dashboard prominently displays the current gestational age, formatted clearly as weeks and days (for example, "14 weeks, 3 days").
  • Trimester Indication: Gestational age is categorized by trimester (First, Second, or Third), providing immediate context for the current stage of pregnancy.
  • Timeline Visualizer: The app presents a dynamic timeline that measures progress toward the estimated due date. This timeline updates automatically each day and replaces standard period and fertility predictions until the pregnancy concludes.

Setting Up Gestational Age

To display gestational age, the Health app requires key baseline information:

  1. Open the Health app and select the Browse tab.
  2. Tap Cycle Tracking.
  3. Under the pregnancy factors section, set your status to Pregnant.
  4. Enter either your estimated due date, the date of your last menstrual period, or the estimated date of conception.

The app automatically calculates the current gestational age based on this input and adjusts all relevant displays accordingly.

Pregnancy Symptom Logging

iOS 18 expands the Health app's symptom logging library to include metrics and conditions commonly experienced during pregnancy. Users can record both recurring and acute symptoms to identify patterns or share data with healthcare providers.

Pregnancy-Specific Symptoms

Users can quickly log entries for conditions such as:

  • Morning sickness, nausea, and vomiting
  • Fatigue and sleep disturbances
  • Breast tenderness and changes
  • Braxton Hicks contractions
  • Pelvic and lower back pain
  • Mood changes and emotional well-being

Logging Details and Severity

When entering a symptom, the app allows users to document specific details:

  • Severity Levels: Symptoms can be designated as Mild, Moderate, or Severe.
  • Frequency: Users can specify whether a symptom was present for part of the day or throughout the entire day.
  • Notes and Context: Custom notes can be added to individual entries to capture specific triggers, times of day, or remedies used.

Beyond manual symptom logging, the Health app uses gestational age to contextualize other health metrics:

  • High Heart Rate Notifications: Because resting heart rate naturally increases during pregnancy, the app prompts users to review their high heart rate notification thresholds.
  • Mental Health Check-Ins: The app surfaces reminders to log emotional well-being and complete standardized depression risk assessments, which are critical during the perinatal and postpartum periods.
  • Walking Steadiness: As the center of gravity shifts in later trimesters, the app can alert users to changes in their walking steadiness to help prevent falls.