Why can't I detect ovulation?

First, measuring basal body temperature may not accurately determine ovulation. Basal body temperature refers to a person's body temperature during sleep, usually measured when waking up in the morning. While this test can measure changes in a person's body temperature, it doesn't completely determine when a person is ovulating. This is because a woman's body temperature may rise during ovulation, but it may also be affected by other factors, such as weather, exercise, etc.

Secondly, testing with a pregnancy test stick or thermometer may not accurately determine ovulation. While these tests can measure changes in a person's temperature, they don't completely determine when a person is ovulating. This is because during the ovulation period, a woman's body temperature changes may be affected by many factors, such as diet, exercise, emotions, etc.

Finally, some people may have trouble detecting ovulation, which may be related to individual body differences. For example, some women may not be able to accurately measure their basal body temperature or use a pregnancy test stick or thermometer due to individual differences.