Ovulation: Signs, Timing, and Fertility Concerns - Obstetrics and Gynecology

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When does ovulation occur?


On the eighth day of the menstrual cycle, if the body temperature drops, could that day be considered ovulation day (with a little menstrual bleeding still present)? Is it possible to conceive? The menstrual period typically starts and then stops after four days, with a small amount of bleeding resuming for about two days, lasting a total of approximately five days.
Is this abnormal? Does it reduce the chances of pregnancy?

Lanlan, 30~39 year old female. Ask Date: 2003/01/07

Dr. Lü Lizheng reply Obstetrics and Gynecology


Hello! 1.
Measuring body temperature may not accurately reflect ovulation; it is necessary to measure over several months to identify patterns.
Additionally, correlating with blood test results or ultrasound findings is essential for accurately determining ovulation days.
If it is indeed the day of ovulation, there is a possibility of pregnancy.
2.
Certain conditions can lead to a biphasic menstrual cycle, such as poor ovulation and irregular growth of the endometrium, resulting in irregular shedding.
This may also interfere with menstrual flow, prolonging the duration.
Among the aforementioned reasons, poor ovulation and inflammation significantly reduce the chances of pregnancy, while fibroids and polyps may cause a slight decrease.
It is essential to visit a hospital for further examination to establish the underlying causes.
Sincerely, Dr.
Lu Li-Cheng, Department of Obstetrics and Gynecology, Taoyuan Hospital, Ministry of Health and Welfare.

Reply Date: 2003/01/07

More Info


Understanding ovulation and its signs is crucial for women who are trying to conceive or are concerned about their menstrual health. The menstrual cycle is typically divided into several phases, with ovulation occurring approximately midway through the cycle. However, the timing can vary significantly from woman to woman.

1. Ovulation Timing: Ovulation generally occurs about 14 days before the start of the next menstrual period. For women with a regular 28-day cycle, this would typically be around day 14. However, cycles can vary in length, and ovulation can occur earlier or later. If you notice a drop in basal body temperature (BBT) around day eight of your cycle, it may not necessarily indicate ovulation. Typically, a rise in BBT occurs after ovulation due to increased progesterone levels. If your temperature drops on day eight and you still have some bleeding, it could be a sign of hormonal fluctuations rather than ovulation.

2. Signs of Ovulation: Common signs of ovulation include changes in cervical mucus (which becomes clearer and more slippery), mild cramping or pain on one side of the abdomen (known as mittelschmerz), and an increase in libido. Some women also experience breast tenderness or bloating. If you are experiencing these signs, it may indicate that you are approaching ovulation, but the exact timing can be tricky to pinpoint.

3. Menstrual Irregularities: The presence of bleeding four days after your period, followed by a few days of light spotting, can be concerning. This could be due to several factors, including hormonal imbalances, stress, or even conditions like polycystic ovary syndrome (PCOS). Irregular bleeding can affect your chances of conception, as it may indicate that ovulation is not occurring regularly. If you are experiencing significant changes in your menstrual cycle, it is advisable to consult with a healthcare provider for further evaluation.

4. Impact on Fertility: Irregular cycles and abnormal bleeding can potentially reduce your chances of conception. If ovulation is inconsistent, it becomes more challenging to time intercourse for optimal fertility. Additionally, conditions that cause irregular bleeding, such as fibroids or endometriosis, can also impact fertility. It is essential to monitor your cycle and any symptoms you experience closely.

5. When to Seek Help: If you have concerns about your menstrual cycle or fertility, it is crucial to speak with a healthcare provider. They can perform tests to check hormone levels, assess for any underlying conditions, and provide guidance on how to improve your chances of conception. Lifestyle factors, such as maintaining a healthy weight, managing stress, and avoiding smoking, can also play a significant role in fertility.

In summary, while a drop in temperature on day eight of your cycle may not definitively indicate ovulation, it is essential to consider other signs and symptoms. Irregular bleeding patterns can affect fertility, and consulting with a healthcare provider can help identify any underlying issues and provide strategies for improving your chances of conception.

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