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This is true.  Doctors do want to know when we had our very first period.  I don't understand the significance really.  All it does is allow your OBGYN to get a full history on you if you are going to be their patient on a long term basis.  The more they know about you, the easier it will be for them to determine other things.  The beginning of each menstrual cycle is a different issue.  That only serves the purpose of helping determining insemination and child birth.