https://techcrunch.com/2019/06/03/apples-cycle-tracking-feature-leads-new-additions-to-apple-watch-and-is-available-on-health-ios/

Today at Apple’s annual developer’s conference Apple added a cycle tracker for women the Apple Watch and iOS. This is being billed as a marquee new feature in its updates to the Apple Watch’s health app.

“In watchOS 6 the cycle tracking app gives you a simple discreet way to visualize your cycle right on your wrist,” said Dr. Sumbul Desai speaking on stage at WWDC ’19.