Most women rely on a thermometer to measure their fertility throughout the month. Their internal body temperature fluctuates with their ovulation cycle, so it drops when an egg is released and returns to normal levels after the cycle ends. The thermometer has proved a reliable method since at least the 1960s and '70s, albeit one that’s time-consuming and kind of annoying. Now, a new wearable called Ava wants to replace the decades-old technique. It claims to be the world’s first fertility wearable that helps women plan for conception, although it’s not for women who have infertility. It makes tracking a temperature reading easier, but more than anything else, it helps women plan ahead by prompting them to have sex while they’re...
