Vaginal bleeding during your period is normal. But what does it mean when you notice bleeding in the middle of your cycle? Learn more about the possible causes
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Common causes of spotting and how to track it
Spotting vs. period: Differences and common causes
Menstruation - Wikipedia
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How Pelvic Inflammatory Disease Affects Your Periods: John Paul Roberts, MD, FACOG: OBGYN
Is Spotting Between Periods Normal?: Darin Swainston, MD, FACOG: OB/GYNs