The basal body temperature fluctuates daily, some days more than others. Changes in your routine can cause fluctuations as well – for example, change in sleep, travel, and sickness can cause the basal body temperature to fluctuate. These factors can cause the Natural Cycles' algorithm to take longer to understand where you are in your cycle.
The app will indicate that you have "fluctuating temperatures" if it having difficulties finding your ovulation day, due to a large spread among your temperatures (variation). Every now and then, the app may send you a warning in a message, about very high or low values, please remember to take these messages into consideration – it's the app trying to help you.
Under the My Cycle tab (statistics) in your app, the app may show you that your temperature variation is 'unstable' under My temperatures. Your temperature variation is the number of degrees that your temperature is likely to change within each cycle. If it shows 'unstable,' a good thing to do is to check out our guidelines on how and when to measure your temperature. Most often, it may just be a small, simple, adjustment you may need to do to improve your measurements.
If you’re working shifts please Read more here.
If you have a baby or small children waking up at night
If you have a baby or small children and need to wake up during the night often, we recommend you measure after your longest stretch of sleep or measure after you have had at least three hours of sleep. Read more.
If you travel within different time zones and/or to a different climate, add the temperature as "excluded" the first 1-2 days so that your body gets used to the temperature change and then measure as usual. Read more.
Do you have very few data points?
If you have a few data points (such as when you've just started with Natural Cycles) and believe that your temperature fluctuates, keep measuring until you complete one cycle of measuring and adding data. A cycle begins on the first day of menstruation and ends when your next menstruation begins. The app will show you each cycle individually in the graph view. The graph is the best place to spot a fluctuation.
Are you measuring according to our guidelines?
Always measure before you get out of bed and as soon as you wake up. Read more.