Fertility Fitbit

​Hopeful moms-to-be wear the Ava at night, on either wrist. As they sleep, the bracelet monitors your pulse, breathing, sleep quality, heart rate variability, skin temperature, and other metrics, each of which is affected by the monthly surge in reproductive hormones estradiol and progesterone. When the mom wakes up, she syncs the bracelet with its companion app and bingo — the Ava app shows her which cycle phase she’s in and, if it’s a fertile one, turns from lavender to pink to indicate, even to a couple glancing at the app from across the room, it’s time to get busy.

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