Fertility Friend will detect ovulation once it is clear that a thermal shift (best when correlated with your other fertility signs) is sustained. Usually you need to see at least three higher temperatures to confirm ovulation since a single higher temperature does not always indicate ovulation. A single higher temperature could be a fluke or could be affected by non-hormonal factors. Keep having intercourse until ovulation is confirmed by a clear and sustained thermal shift and ovulation is detected on your chart.
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