Who can use femSense?

femSense is suitable for women of fertile age between 16-49 years of age who have regular cycles between 21 and 35 days and cycle length variations of +/- 3 days or less.

If you have irregular cycles, the reliability of femSense may decrease, so in this case you should consult a doctor before using femSense.

If you are currently on hormone therapy, femSense accuracy may be affected because hormone medications often affect body temperature as well.

Also, femSense may not be able to reliably determine your ovulation for some medical indications, see this article for more information.