Delayed Menstruation: Antibiotics, Pregnancy Risks, and When to Seek Help

Delayed menstruation?

Xiao Yan, 20~29 year old female. Ask Date: 2017/05/16

Dr. Huang Jianzhong reply Obstetrics and Gynecology

I usually have a regular menstrual cycle, but today is the fifth day of my missed period.
I was hospitalized for 7 days due to a kidney infection caused by a urinary tract infection, and I was discharged on May 4th.
During my hospitalization, I was treated with antibiotics, which I stopped taking on May 11th.
I typically experience breast tenderness as a premenstrual symptom a week before my period, but this time I have had no symptoms up to today.
I have had sexual intercourse without a condom, but my partner pulls out before ejaculation.

1.
Could the antibiotics have caused my delayed period?
Answer: It is rare for antibiotics to cause a delayed menstrual cycle.
2.
Is there a high chance of pregnancy?
Answer: Given that intercourse occurred without a condom and your partner pulls out before ejaculation, there is a higher chance of pregnancy.
3.
How many days late should I wait before seeing a gynecologist?
Answer: If your period is 7 days late, you should first take a home pregnancy test.

Reply Date: 2017/05/16

More Info

Delayed menstruation can be a source of concern for many women, especially when there are recent health issues or changes in medication. In your case, the combination of a urinary tract infection (UTI), subsequent kidney inflammation, and the use of antibiotics could potentially contribute to your delayed period. However, it is essential to consider various factors that could influence your menstrual cycle and the possibility of pregnancy.

Firstly, antibiotics can sometimes affect the menstrual cycle, but this is not common. Most antibiotics do not have a direct impact on hormonal balance or menstrual regularity. However, certain antibiotics may interact with hormonal contraceptives, potentially reducing their effectiveness, which could lead to unintended pregnancy. Since you mentioned that you had unprotected intercourse, there is a possibility of pregnancy, especially if your partner withdrew before ejaculation but did not use any other form of contraception. The withdrawal method is not entirely reliable, as pre-ejaculate fluid can contain sperm.

Given that your period is already five days late, it would be prudent to take a home pregnancy test to determine if you are pregnant. These tests are generally accurate when taken after a missed period. If the test is positive, it is advisable to schedule an appointment with your healthcare provider to confirm the pregnancy and discuss any necessary steps moving forward.

If the test is negative and your period does not start soon, it would be wise to consult with a gynecologist. They can evaluate your menstrual irregularity and consider other potential causes, such as stress, hormonal imbalances, or underlying health conditions. Stress, in particular, can significantly affect menstrual cycles, and the stress of hospitalization and illness may have contributed to your current situation.

In summary, while antibiotics are unlikely to be the primary cause of your delayed menstruation, the possibility of pregnancy should be considered, given the circumstances. Taking a pregnancy test is a crucial first step. If the result is negative and your period does not resume, seeking medical advice is essential to rule out any other underlying issues. Your health and well-being are paramount, and addressing these concerns with a healthcare professional will provide you with the guidance and support you need.

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