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Your period does not always arrive or leave when you expect it to. A missed period happens when ovulation (release of an egg) does not occur, or when hormonal changes come in the way of the normal ...

For many women, missing a menstrual cycle can immediately spark worry or confusion. The most common assumption is pregnancy, but doctors caution that a missed period does not always mean conception.

Add Yahoo as a preferred source to see more of our stories on Google. FotoDuets/Getty Images For many people, a missed period is the first signal that they're pregnant. However, this often isn't the ...