Delayed Menstruation: Allergy Medications and Pregnancy Concerns

Menstruation is two weeks late?

Since the last menstrual period, I have had several sexual encounters with my girlfriend, and we used condoms throughout.
After ejaculation, we checked the condom each time to ensure it did not break.
However, my girlfriend has been feeling weak and is sensitive to cold, and her menstrual cycle can be irregular at times.
Last month, her period came on time within 31 days, but this month she has taken allergy medication for several days, which I found online can have side effects that may delay menstruation.
Now that her period has not arrived, she has temporarily stopped taking the medication.
She has been experiencing symptoms that suggest her period is approaching, such as abdominal discomfort for several days, but it still hasn't come.
Doctor, how long can allergy medications generally delay menstruation, and can we rule out the possibility of pregnancy?

Xiu, 20~29 year old female. Ask Date: 2020/03/27

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, the chances of pregnancy should be low.
Let's wait and see if your period comes.
Wishing you good health.

Reply Date: 2020/03/27

More Info

When it comes to delayed menstruation and the potential effects of allergy medications during pregnancy, it’s essential to consider several factors. First, let's address the concern regarding the use of allergy medications and their impact on menstrual cycles. Many allergy medications, particularly antihistamines, can have side effects that may influence menstrual regularity. Some women report changes in their menstrual cycles, including delays, after taking these medications. However, the extent of this effect can vary significantly from person to person.

In your case, since you mentioned that your girlfriend has been taking allergy medications for several days, it is plausible that these medications could contribute to her delayed menstruation. However, it’s also important to note that stress, changes in weight, hormonal imbalances, and other health conditions can also lead to irregularities in the menstrual cycle. Given that your girlfriend has a history of feeling physically weak and cold, these factors could also play a role in her menstrual irregularity.

Regarding the concern about pregnancy, you mentioned that you and your girlfriend have been using condoms consistently and have checked for any breakage. If the condoms were used correctly and there were no signs of failure, the likelihood of pregnancy is significantly reduced. However, no contraceptive method is 100% effective, and if there is any doubt, it would be prudent for her to take a home pregnancy test. These tests are generally reliable and can provide peace of mind.

If the pregnancy test is negative and her period still does not arrive, it may be advisable for her to consult a healthcare provider. A doctor can perform a more thorough evaluation, which may include a physical examination and possibly blood tests to check hormone levels. This is particularly important if her menstrual irregularities persist or if she experiences other concerning symptoms.

In terms of the duration of delayed menstruation due to allergy medications, it can vary widely. Some women may experience a delay of a few days to a week, while others might see more prolonged effects. If the medications are discontinued and her menstrual cycle does not return to normal within a reasonable timeframe, further investigation may be necessary.

In summary, while allergy medications can potentially cause delays in menstruation, it is essential to consider other factors that may contribute to this irregularity. Given the consistent use of condoms, the risk of pregnancy is low, but a pregnancy test can provide clarity. If her period does not resume soon, seeking medical advice would be the best course of action to rule out any underlying issues and ensure her overall health.

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