Why did Clue remove the fertile window only to announce a contraceptive?

The fertile window in Clue Period Tracking mode was an estimation based on scientific literature that didn’t account for cycle variation and wasn’t backed by any medical evidence that prevented pregnancy. Clue Birth Control is a regulated medical device that has been clinically determined to be an effective birth control. 


Check out this article on why we removed the fertile window: https://helloclue.com/articles/how-to-use-clue/why-we-are-removing-the-fertile-window

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