Selene

The Fertility Awareness iPhone app for serious women

Automatic Fertility Detection

Selene can attempt to detect your ovulation day and likelihood of fertility during your cycle. The estimate is based entirely on the data you enter, and cannot be good unless you chart carefully. Incorrect or incomplete chart data can cause incorrect predictions of your fertility. You must use your own judgement. Selene does not provide medical advice; please consult your doctor.

Selene can evaluate your chart by the rules of Taking Charge of Your Fertility by Toni Weschler.

Selene considers the following signs when doing automatic fertility detection.

Selene is cautious about identifying a probable ovulation date, and will not do so if you have not entered enough data for the cycle for it to be confident. If you believe Selene is not calculating your chart correctly, please report the issue and we will be glad to investigate.

Fertility Prediction Rules

Selene evaluates the following rules when making fertility predictions:
  1. First Days Rule: If you had a clear temperature shift 12 to 16 days prior, the first 5 days of your cycle are considered infertile.
    • Unless any of the last 12 cycles were 25 days or shorter, then only 3 days are considered infertile.
  2. Dry Days Rule: Before ovulation, you are considered infertile on dry (not sticky) days.
    • Days with menstrual flow are considered to have unknown cervical fluid.
  3. Dry Days Rule: Before ovulation, you are considered infertile on dry (not sticky) days.
    • Days with menstrual flow are considered to have unknown cervical fluid.
  4. Thermal Shift and Peak Day Rules: After ovulation, you are considered infertile once both of the following have occurred:
    • The evening of the fourth day after the Peak Day, and
    • The evening of the third consecutive day above the cover line.
  5. Wet Days Rule: You are considered to have your best chance of becoming pregnant on any day of creamy or wetter cervical fluid before your thermal shift, plus the day of your thermal shift.

Frequently Asked Questions

Selene thinks I might be fertile on day 1 of my cycle.

If you did not have a clear thermal shift 12 to 16 days prior, you may be having irregular and unpredictable cycles. The rules are cautious in this circumstance, as menstrual flow can mask the presence of cervical fluid. As always, you should use your own judgement.

Selene is calculating the wrong cover line for me.

This may result from an outlying high temperature early in your cycle. To ignore that outlier by the Rule of Thumb:

  1. On the Chart tab, touch the chart to select the day with the unreliable temperature.
  2. Tap the circled blue arrow button in the callout box to go to the Day tab.
  3. Tap the grey "+" icon to add a note. The "pick notes" list will open.
  4. Tap any appropriate item under "Interferences".
  5. You should get a message "Exclude temperature?". Choose "Exclude."
Selene will recalculate your cover line ignoring this day.

Selene has picked the wrong ovulation day for me.

There are many circumstances in which it may be uncertain exactly when your ovulation occurred, such as if you have a slow rise in temperature or multiple days of midcycle spotting. If you believe Selene has marked the wrong day as most likely for your ovulation, you can easily override.

  1. On the Chart tab, touch the chart to select the day you want to mark.
  2. Tap the circled blue arrow button in the callout box to go to the Day tab.
  3. Tap "days past ovulation". The "set ovulation day" menu will open.
  4. Tap "Occurred this day".
Selene will redraw your chart with the new marked ovulation day.

Selene still thinks I might be fertile, even though my temperature has shifted.

Selene is cautious about marking you as likely safe for contraceptive purposes. If there are any conflicting signals, it shows you as possibly fertile -- as always, you must use your own judgement. Some possible conflicting signs:

All of these circumstances can be indications that your identified ovulation date might be mistaken, so you should not assume you are safe.

Selene has marked me as maybe fertile on a day I didn't even enter any data.

Yes. Selene is cautious about marking you as likely safe for contraceptive purposes, and assumes you may be fertile unless you have entered data indicating that you are not. (As always, you must use your own judgement.)

If you have other questions or concerns please contact support@daringplan.com.