use an ovulation predictor kit (OPK), or use an Ovulation Calculator. Ovulation is when you release an egg from one of your ovaries. Usually, your body releases one egg at a time, once per month.

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In “Second Life,” the journalist Amanda Hess navigates the stratified landscape of contemporary reproductive technology.

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But there's one feature that gives the WHOOP a leg up: the sleep debt calculator. The app informs you how much ... track the ebb and flow of it throughout your cycle with predicted ovulation dates and ...