Apple Watch fertility tracking just got a massive upgrade — what you need to know

When Apple announced its skin temperature sensor in the Apple Watch 8 and Apple Watch Ultra, it made a big deal about the watch being used to track your fertility. 

Using two built-in sensors, the Apple Watch Series 8 and the Apple Watch Ultra have the ability to read the temperature of the skin every five seconds overnight (this sensor will also be available on the Apple Watch Series 9 and Apple Watch Ultra 2, launching this month). 

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