Your Menstrual Cycle During Pregnancy Preparation - Obstetrics and Gynecology

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Menstruation has started while trying to conceive?


Hello, Doctor: I am currently trying to conceive.
My basal body temperature is around 36.4°C during the low phase and 36.6°C during the high phase.
The temperature rises slowly, taking at least about 4 days, and the high phase lasts only 12 days.
My usual cycle is 30 days, but this time my cycle was 34 days before my period started.
I noticed that there were more blood clots than usual.
Is this a normal situation? Does this indicate a failed pregnancy? When would be the best time to seek medical attention? Should I wait until after my menstrual flow has completed?

E, 30~39 year old female. Ask Date: 2021/06/20

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it seems that your menstrual period has started.
Your temperature chart looks normal, so just keep observing.
Wishing you good health.

Reply Date: 2021/06/20

More Info


Understanding your menstrual cycle during pregnancy preparation is crucial for identifying potential issues and optimizing your chances of conception. Your observations regarding your basal body temperature (BBT) and menstrual cycle are important indicators of your reproductive health.

Firstly, let's break down your BBT readings. A typical menstrual cycle involves a biphasic temperature pattern: a lower temperature phase (follicular phase) before ovulation and a higher temperature phase (luteal phase) after ovulation. The fact that your BBT rises to around 36.6°C after ovulation and remains elevated for about 12 days suggests that you are likely ovulating, which is a positive sign for fertility. However, the slow rise in temperature and the duration of the high-temperature phase can vary among individuals and may not necessarily indicate a problem.

Regarding your menstrual cycle, a regular cycle typically ranges from 21 to 35 days. Your cycle length of 30 to 34 days falls within this range, but the presence of blood clots and heavier bleeding than usual can be concerning. Blood clots during menstruation can occur for various reasons, including hormonal fluctuations, uterine fibroids, or other underlying conditions. While some women experience heavier periods as a normal variation, it is essential to monitor any significant changes in your menstrual pattern.

If you suspect that you may have experienced a failed pregnancy (chemical pregnancy), it is important to note that this can occur shortly after implantation, often resulting in a late period with heavier bleeding. However, it is also possible that the changes in your cycle are unrelated to pregnancy and may be due to other factors such as stress, diet, or hormonal imbalances.

In terms of when to seek medical advice, it is generally advisable to consult with a healthcare provider if you experience any of the following:
1. Heavy Bleeding: If you soak through a pad or tampon in an hour or less for several hours.

2. Severe Pain: If you experience significant abdominal pain that is not relieved by over-the-counter pain medications.

3. Prolonged Symptoms: If your menstrual symptoms last longer than a week or if you have persistent irregularities in your cycle.

4. Concerns About Fertility: If you have been trying to conceive for over a year (or six months if you are over 35) without success.

It may be beneficial to wait until your menstrual flow has completed before scheduling an appointment, as this will provide your healthcare provider with a clearer picture of your cycle. However, if you feel that your symptoms are severe or concerning, do not hesitate to seek medical attention sooner.

In conclusion, while your observations about your BBT and menstrual cycle are important, they should be interpreted in the context of your overall health and any accompanying symptoms. Keeping a detailed record of your cycle, including BBT, menstrual flow, and any other symptoms, can be helpful for your healthcare provider in diagnosing any potential issues. If you have ongoing concerns about your menstrual cycle or fertility, consider discussing them with a healthcare professional who specializes in reproductive health.

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