Do you never know when you're going to get your period? Do you have no idea how to tell when you're ovulating, or why it even matters to bother trying to figure it out? Did you know that you're not actually fertile every day of the month? Pregnancy is not a possibility any and every day of the year. Women have infertile periods of time during each monthly cycle. There is a foolproof way to figuring out when both your fertile and infertile times are, and to know when your period is coming...