femSense is most reliable with cycles of regular length between 21 and 35 days. Shorter or longer cycles decrease the reliability of femSense. If you have very irregular cycles (a regular deviation of more than +/- 3 days), we recommend that you consult your doctor before using femSense.
For information regarding femSense and PCO/PCOS, please visit: Can I use femSense, if I have PCO?
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