October 6th, 2007, 01:13 PM
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CD1 is the first day that you bleed heavy enough for a pad or tampon to be needed. So if you start bleeding at 8 am, 2 pm, or 10 pm..if you need a pad, it's CD1. You don't have to start temping on CD1, some women choose to skip while AF is in town. As long as you note what day you started true bleeding on, you can start charting from there.
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