Add Yahoo as a preferred source to see more of our stories on Google. If you get a monthly period, your monthly menstrual cycle sets the rhythm for so many parts of your life — from sex to digestion ...

You're most likely to get pregnant if you have sex about once a day for the five days around the time you ovulate. Your cycle begins on the first day of your period and ovulation happens around 14 ...

While you may want your menstrual cycle to be regular, ovulation isn't always on time. Your periods are "irregular" if they come less than 21 days or more than 35 days apart. Your menstrual cycle ...