Why Is My Period Late? Possible Causes and Concerns - Obstetrics and Gynecology

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Why hasn't my period come?


I haven't gotten my period on the third day, but I've been staying up late and usually sleep around six or seven in the morning.
I also tend to worry about various things.
Should I be concerned about being pregnant? I haven't had sexual intercourse for the past week, and I just had an encounter today.
My period hasn't arrived, my face feels warm, and I've caught a cold.
Sometimes my stomach hurts.
Could you please help me with this?

Lin Xuan, 10~19 year old female. Ask Date: 2013/12/31

Dr. Yang Wangjun reply Obstetrics and Gynecology


Hello: (1) A complete menstrual cycle includes the follicular phase, ovulation phase, luteal phase, and menstrual phase.
Typically, conception occurs during the ovulation phase.
The duration from ovulation to the menstrual phase is approximately 14 days.
Therefore, if pregnancy is present now, the conception would have occurred about two weeks ago.
(2) If menstruation is delayed, it is advisable to first take a pregnancy test to check for pregnancy.
If the test is negative, it may be due to anovulation, and a menstrual induction injection can be administered.
Thank you for your message!

Reply Date: 2013/12/31

More Info


When it comes to a late period, there are several factors to consider, especially if your menstrual cycle has been regular in the past. The primary reasons for a delayed period can include pregnancy, stress, hormonal imbalances, lifestyle changes, and underlying health issues. Given your situation, let's break down the potential causes and concerns.

1. Pregnancy: The first thing that comes to mind when a period is late is the possibility of pregnancy. Since you mentioned that you had sexual intercourse recently, even if it was a week after your last sexual encounter, it’s important to consider that sperm can survive in the female reproductive tract for up to five days. If you had unprotected sex during your fertile window, there is a chance of conception. It would be advisable to take a home pregnancy test if your period does not arrive soon.

2. Stress and Lifestyle Factors: You mentioned that you have been staying up late and experiencing stress. Both of these factors can significantly impact your menstrual cycle. Stress can lead to hormonal fluctuations that may delay ovulation, which in turn can delay your period. The body’s response to stress involves the release of cortisol, which can interfere with the hormones that regulate your menstrual cycle. Additionally, irregular sleep patterns can disrupt your circadian rhythm, further affecting your hormonal balance.

3. Health Issues: You noted experiencing symptoms like a warm face and abdominal pain, along with a cold. While these symptoms may not directly relate to your menstrual cycle, they could indicate that your body is under stress or fighting an infection, which can also affect your period. If you are feeling unwell, it’s essential to take care of your health, as illness can sometimes lead to changes in your menstrual cycle.

4. Hormonal Imbalances: Conditions such as polycystic ovary syndrome (PCOS) or thyroid issues can cause irregularities in your menstrual cycle. If your period continues to be delayed or if you experience other unusual symptoms, it may be worth consulting a healthcare provider for further evaluation.

5. Other Factors: Changes in weight, diet, and exercise can also influence your menstrual cycle. If you have made any recent changes in these areas, they could be contributing to your late period.

In summary, while there is a possibility of pregnancy, it is also essential to consider the impact of stress, lifestyle changes, and overall health on your menstrual cycle. If your period does not arrive soon, or if you have concerns about your symptoms, it would be wise to take a pregnancy test and consult with a healthcare provider. They can provide a more comprehensive evaluation and help determine the underlying cause of your delayed period. Remember, it’s always better to seek professional advice when it comes to your health and well-being.

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