Dame Jessica Ennis-Hill has launched Jennis, a period tracking app. The Team GB Olympic champion was motivated to create the software that allows users to monitor their menstrual cycle on memories on being too “preoccupied and worried” to enjoy her victories because of the sudden arrival of her period. The 36-year-old former heptathlete told BBC News: “I was so preoccupied and worried that anyone was going to see that I started my period and that I didn’t have the right protection to sort myself out” I remember just running that 800m thinking I’m trying to run for a gold medal here but I’m als…