Why are multiple peak days predicted?
The NFP program for Palm OS independently predicts peak day for each fertility indicator. As a result, multiple peak days may be predicted if different indicators do not line up, representing uncertainty in predicting peak day. For fluid information and cervical information, NFP predicts peak day to have occurred on the last day of the highest fertility recorded. For temperature information, peak day is predicted to have occurred two days before the temperature rise. While this varies from month to month and from person to person, two days is often quoted as the average and is used by NFP. If your temperature rises one day after peak, your chart will show multiple peak days. However, predicted infertile days should still be relevant. It is important for you to understand how NFP predictions are made so as to come to your own fertility conclusions.
