The menstrual cycle is like a dance that happens every month inside you. It starts on the first day of your period and ends the day before the next one. During this time, your hormones work together to prepare the egg and the uterus. Understanding your cycle helps you know when your period will arrive and why your mood changes sometimes. It's your personal map of self-knowledge! Soso helps you record every step of this dance so you always feel in control and safe.