kegg is an intuitive fertility tracker that measures the most accurate sign to a woman’s fertile window: cervical fluid. Shaped as a kegel ball smaller than an egg, kegg uses advanced sensing technology to track the electrolytes levels of cervical fluid — the key metric to determine the chances of conception within each menstrual cycle. Within 2 minutes of testing per day, you’ll get in-depth insights on your fertile cycle in real-time via the kegg mobile app.