An Apple Watch screen shows the cycle tracking feature.
The Apple Watch cycle tracking app.

The Apple Watch Series 8 will give users a better idea of when they will have sex.

The built-in menstrual cycle tracking app on the Apple Watch Series 8 will check the wearer's temperature at the wrist every five seconds during the night. Since body temperature changes over the course of a woman's menstrual cycle, this should allow for ovulation tracking.

The cycle tracking app will be changed to flag any abnormality in a user's menstrual cycle based on the data they input about their periods. During the launch event, the vice president of health at Apple said that a deviation from a normal cycle can be a sign of a health condition.

People who are trying to get pregnant can use Apple's ovulation detection feature. It is possible to inform your family planning with your healthcare provider if you are trying to have a baby.

An iPhone screen showing a chart of wrist temperature data collected on Apple Watch.
Apple Watch Series 8 samples wrist temperature every five seconds overnight.

People who use temperature information to predict when they're most likely to get pregnant have to take their temperature manually. The Oura ring collects temperature and other types of user data to predict when someone might start their period.

The method of temperature-based cycle tracking and ovulation detection is used to prevent pregnancies. It isn't a good method for people with irregular cycles because it's difficult to get right.

The FDA doesn't approve Apple's feature as a birth control because it isn't approved as a contraceptive. The new features are close to what is allowed to be marketed as birth control. The FDA cleared the app Natural Cycles to be used as a birth control, even though it uses body temperature and cycle tracking information to predict when someone is most likely to get pregnant.

The FDA has given clearance for Natural Cycles to use information from Wearable Devices. The Oura ring has temperature information. The potential to pull in information from the Apple watch has been discussed by Natural Cycles. Before that could happen, the company would have to conduct validation tests. The use case will be dependent on how accurate it is.

In the few months after the Supreme Court ended federal protection for abortion, Apple is adding cycle tracking features. Experts haven't seen cycle tracking information used to prosecute people suspected of having abortions in places where it's no longer legal

During the event, Desai said that Apple can't read or decode cycle tracking data. She said that your health data is your own.

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