Ovulation tests detect an increase in luteinizing hormone (LH). This LH surge causes the ovary to release an egg (ovulation). Ovulation typically occurs 24 to 48 hours after the LH surge, which is why Flo predicts ovulation the following day after a positive test result is logged.
However, it is also possible to receive a negative result and still ovulate. For example, if you have an LH surge, you may take a test before your surge is detectable by your kit and another test when LH has already begun to decrease and is no longer detectable by the kit.
This is why we don’t rely on negative ovulation tests, because we don’t know if ovulation has already happened or if it hasn’t happened yet.
If you’re currently planning a pregnancy, Flo has a function for that, with plenty of relevant content in the Insights tab and personalized daily stories. This mode is activated by setting your goal in the app to “Get pregnant.” To change your goal, navigate to Menu (your avatar) > My goal > Get pregnant.
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