My period is, and always has been, very regular, reliably arriving every 21 days. So when it was 10 days late this past September, I freaked out and called my doctor to figure out what the heck was ...

There’s a certain kind of tired that hits before your period—and it’s not just the usual PMS moodiness or bloating. It’s heavier. Almost like you’re catching something. Your body starts to feel sore, ...