Reprinted from S.E.X.: The All-You-Need-to-Know Progressive Sexuality Guide to Get You Through High School and College, © 2007 Heather Corinna/Marlowe & Company. Illustration by Molly Crabapple.
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It's really hard to say when your periods might develop a discernible pattern. In general, we would probably expect to see that happen within the first 3-5 years of menstruation. However, that is a very general guideline because there are a lot of other factors that could be at work as well. Your…
