Once you start using the Oura Ring, you will see a marker on your graph that denotes the day you switched to syncing with your Oura Ring. We recommend that you start using the Oura Ring at the start of your period once you’ve received your Oura Ring – this will make for a smoother transition with fewer red days.
Your past oral temperatures will still be visible in the app (for example in the Graph view and the Add Data view), however, the algorithm will no longer take them into account when assessing the day-to-day fertility status and detecting ovulation. This means that the oral temperatures and the temperatures converted from your Oura Ring are not mixed. As a result, your cover line will disappear and, eventually, the algorithm will establish a new cover line based on your temperatures converted from your Oura Ring.
However, the algorithm will continue to use your previously detected cycle characteristics (such as ovulation days or cycle lengths) in the predictions for the upcoming cycles. All your cycle statistics from your past cycles will also still be visible to you in the My Cycle tab > Insights.
There are no changes to Natural Cycles’ effectiveness between using an Oura Ring or using the NC° thermometer: Natural Cycles is 93% effective with typical use and 98% effective with perfect use.
The biggest difference with using an Oura Ring as opposed to an oral thermometer is that you will no longer have to remember to measure your temperature every morning. To learn more about how the Oura Ring works with Natural Cycles, please read on here.