There are certain factors that can influence your basal body temperature. These should be noted in the notes section of Fertility Friend or checked on the checklist/specifics on the data entry page.
These factors will usually not make charting and chart analysis impossible, especially if they occur only rarely, though it may be more challenging. In most cases, even when these factors apply on an ongoing basis, they will not skew your data so much that reading the chart is impossible. It is important to make a note of the factors, however to help with the interpretation of the chart. The following factors may influence your BBT:
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