Basal Body Temperature: Signs of Ovulation and Menstruation - Obstetrics and Gynecology

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Understanding basal body temperature (BBT) is crucial for women tracking their ovulation and menstrual cycles. BBT is the body's temperature at rest, and it can provide insights into hormonal changes throughout the menstrual cycle. Typically, BBT is measured first thing in the morning before any activity, and it can fluctuate based on various factors, including hormonal changes related to ovulation.

In a typical menstrual cycle, BBT remains relatively low during the follicular phase (the first half of the cycle) and rises after ovulation due to increased progesterone levels. This rise in temperature is usually around 0.5 to 1.0 degrees Fahrenheit (approximately 0.3 to 0.6 degrees Celsius) and can last until the onset of menstruation. A sustained increase in BBT for more than 14 days often indicates that ovulation has occurred, and if no menstruation follows, it may suggest pregnancy.

In your case, you mentioned that your BBT has been around 36.7 degrees Celsius, with a slight dip to 36.4 degrees during a brief illness. This temperature range is indeed indicative of a potential ovulatory phase, as it is higher than the lower temperatures you reported earlier (36.3 to 36.4 degrees). However, it is essential to note that while a BBT of 36.7 degrees can suggest ovulation, it is not necessarily a definitive sign. The key is to observe the pattern over time rather than focusing solely on a single temperature reading.

Regarding your question about whether this indicates that your period is approaching, it is possible. After ovulation, if the egg is not fertilized, progesterone levels will eventually drop, leading to a decrease in BBT and the onset of menstruation. If your BBT remains elevated for more than two weeks and you have not had a period, it may be worth considering a pregnancy test, especially since you are not using contraception and are planning for another child.

As for the question of whether a high temperature needs to reach 37 degrees Celsius to be considered "high," it is essential to understand that BBT can vary from person to person. While many women may see a significant rise to around 37 degrees Celsius or higher, others may have a slightly lower baseline. Therefore, it is more important to look for a consistent pattern of elevated temperatures rather than fixating on a specific number.

In summary, your current BBT readings suggest that you may have ovulated, especially if they remain elevated for an extended period. Keep tracking your BBT, and consider other signs of ovulation, such as changes in cervical mucus or ovulation pain. If your period does not arrive and your BBT remains high, it may be a good idea to take a pregnancy test. If you have any concerns about your menstrual cycle or fertility, consulting with a healthcare provider or a fertility specialist can provide personalized insights and guidance.