Wearing a Smartwatch During Pregnancy: Questions to Ask Your Clinician

What a smartwatch measures

A smartwatch uses small sensors on the back of the case that touch your wrist. The most common sensor is an optical heart rate sensor, which shines light into your skin and measures changes in blood flow to estimate your pulse. This same optical method can also estimate blood oxygen saturation (SpO2) as described in what is blood oxygen smartwatch. Many watches use this data to calculate sleep stages, recovery scores, and stress estimates.

Some watches include an electrical heart sensor for taking a single-lead electrocardiogram (ECG). This records the timing and strength of the electrical signals that make the heart beat, as explained in What Is ECG on a Smartwatch? How It Works and What to Check. Other common sensors include an accelerometer and gyroscope for movement detection, a skin temperature sensor, and a GPS receiver. Each sensor provides a different type of information, and none of them is a substitute for clinical monitoring during pregnancy.

• Optical heart rate: estimates pulse from blood flow changes
• ECG: records electrical heart signals (requires touching a button or crown)
• Accelerometer: detects movement for step counts and sleep staging
• Skin temperature: measures wrist temperature, often used for cycle tracking
• GPS: tracks outdoor location, pace, and distance

Wellness tracking versus medical devices

The FDA distinguishes between general wellness products, which maintain or encourage a healthy lifestyle, and medical devices, which diagnose, cure, mitigate, prevent, or treat disease. The FDA's General Wellness guidance explains that software intended for maintaining or encouraging a healthy lifestyle and unrelated to the diagnosis or treatment of a disease is not regulated as a medical device. Most smartwatch features fall into this wellness category.

A few features, such as the ECG app on certain Apple Watch models, have received FDA clearance and are regulated as medical device software. However, even these features have important limitations. For example, the ECG app is not intended for use by people under 22 years old, and it only records 30 seconds of heart rhythm at a time. It checks for one specific condition: atrial fibrillation. A clinical ECG performed in a doctor's office uses 12 leads placed on your chest, arms, and legs, as described by MedlinePlus, and gives a far more complete picture of your heart's electrical activity.

During pregnancy, your body undergoes significant changes that can affect heart rate, blood volume, and circulation. A wellness algorithm trained on the general population may not interpret your readings correctly. This is why it is important to understand which features are wellness tools and which have actual regulatory clearance, as discussed in Wellness Features vs Medical Features.

Questions to ask your clinician

Before you rely on any smartwatch reading during pregnancy, talk to your clinician. The right question depends on which features you use and why. Some readings, like resting heart rate and sleep trends, are more useful as long-term patterns than as single measurements. Others, like ECG recordings, are meant for occasional checks rather than continuous monitoring.

Bring your watch to your appointment and show your clinician exactly what data you see. Ask whether the specific features you use are appropriate for your situation. Be honest about what you plan to do with the information. If a smartwatch reading would change a health decision you make, that is a much more serious use than simply logging daily activity.

Write down the questions you want to ask so you do not forget them during the appointment. Your clinician can explain which readings are relevant for your care and which ones you can safely ignore.

• Is it safe for me to wear a smartwatch that tracks heart rate and sleep throughout my pregnancy?
• Should I be concerned if my resting heart rate is higher than it was before pregnancy?
• Does the optical heart rate sensor on my watch provide accurate readings for my skin tone and wrist size?
• If I take an ECG recording at home, should I share it with you, and how?
• Are there any specific readings, like blood oxygen or wrist temperature, that I should report?
• How should I interpret the sleep and activity data from my watch in light of my pregnancy?
• Would you recommend any specific clinical monitoring that a smartwatch cannot provide?

Privacy and data considerations

Smartwatch health data is stored on the watch, synced to your phone, and often uploaded to the manufacturer's cloud service. During pregnancy, the information your watch collects can be particularly sensitive. You should know who can access that data and how it is used. The FTC notes that the Health Breach Notification Rule applies to companies that hold personal health records, and consumer health data is protected under various privacy laws.

Before using health tracking features, read the manufacturer's privacy policy to understand what data is collected, how it is shared, and how you can delete it. This is discussed in more detail in Who Can See Your Smartwatch Health Data? Settings to Check. Some watch platforms allow you to disable cloud sync or use on-device processing, which reduces the amount of data that leaves your phone.

If you share your watch data with your clinician, use the secure method they recommend, such as a patient portal or a printed report. Do not send health data through unsecured messaging apps.

Which features matter for pregnancy

For general wellness during pregnancy, the most useful smartwatch features are activity tracking, sleep monitoring, and resting heart rate trends. Staying physically active is important: the World Health Organization notes that regular physical activity for pregnant and postpartum women decreases the risk of pre-eclampsia, gestational hypertension, gestational diabetes, excessive gestational weight gain, delivery complications, postpartum depression, and newborn complications. A smartwatch can help you maintain a consistent activity routine with gentle reminders.

Cycle tracking features can log pregnancy symptoms and help you see patterns over time, as described in How Cycle Tracking Works on a Smartwatch and What It Predicts. If you use these features, remember that they are designed for logging, not for medical diagnosis.

Features to approach with more caution during pregnancy include blood oxygen measurement, which has accuracy limitations, and ECG recordings, which are single-lead and cannot detect many conditions. If you use these features, treat them as data points for your clinician to interpret, not as self-diagnostic tools.

Bottom line

Wearing a smartwatch during pregnancy is generally safe and can support a healthy, active lifestyle. The sensors emit only low-power light and Bluetooth signals, and the watches are designed for continuous skin contact. But the data they produce is not clinical information.

If you are looking for a smartwatch to track activity, sleep, and general wellness during pregnancy, choose a model with reliable optical sensors, a comfortable band, and long battery life. Our women's smartwatch guides can help you compare options: best women's smartwatches and best small women's smartwatches. If you are already set on a specific platform, compare Apple Watch models.

Whatever you choose, share your decision with your clinician and ask them which readings matter for your care. A smartwatch can be a helpful wellness companion, but it should never replace prenatal checkups, clinical tests, or medical advice.

What to pick for your use

Questions

Is it safe to wear a smartwatch while pregnant?

Smartwatches use low-power optical sensors and Bluetooth radios that are generally considered safe for continuous skin contact. There is no evidence that wearing one during pregnancy causes harm. However, the data they provide is wellness information, not medical guidance. Discuss any health concerns with your clinician.

Can a smartwatch detect pregnancy complications?

No. Smartwatches are not designed to detect or diagnose any pregnancy complication. Even FDA-cleared features like the ECG app check for only a few specific conditions. Changes in heart rate, blood oxygen, or temperature may be useful to discuss with your clinician, but they cannot replace clinical monitoring.

How accurate is a smartwatch heart rate during pregnancy?

Optical heart rate sensors estimate your pulse by measuring blood flow changes. Accuracy varies by skin tone, wrist motion, and how the watch fits. Pregnancy can increase your resting heart rate, so your watch may show readings higher than your pre-pregnancy baseline. Ask your clinician what range is normal for you.

Should I share my smartwatch data with my obstetrician?

You can, but ask your clinician first whether they find it useful. Some may appreciate seeing trends in resting heart rate or sleep, while others may not rely on wearable data. Share data through a secure channel such as a patient portal, and always interpret readings together with clinical guidance.

Can I use the ECG app on my Apple Watch while pregnant?

The ECG app is not intended for people under 22 years old, and its results only apply to the 30-second recording you take. It checks for atrial fibrillation and cannot detect many other heart conditions. If you feel heart palpitations or other symptoms, contact your clinician rather than relying on an ECG wrist reading.

Does a smartwatch emit radiation that could affect the baby?

Smartwatches use Bluetooth, which operates in the 2.4 GHz frequency band at low power levels, as described by the Bluetooth SIG. They also use Wi-Fi and cellular radios in some models. These are the same types of signals used by phones and other everyday devices. There is no established evidence that these low-power transmissions harm a developing baby.