Delayed Period on Birth Control: Is It Normal and What to Do?

Menstruation is delayed after taking pre-exposure prophylaxis (PrEP)?

I am currently taking oral contraceptive pills, and my period is three days late.
Is this considered normal? Additionally, I am taking antibiotics this week, which my doctor said are quite strong.
Will this affect anything? If my period is late, should I wait for it to come before starting the next pack of oral contraceptives, or should I continue taking them as scheduled?

Yu, 10~19 year old female. Ask Date: 2024/02/11

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, it is normal to have your period within a week after finishing the birth control pills.
Just wait and see.
Wishing you good health!

Reply Date: 2024/02/11

More Info

When it comes to delayed periods while on birth control, it’s important to understand that various factors can contribute to this phenomenon. Birth control pills, particularly combination pills, work by regulating hormones to prevent ovulation and manage the menstrual cycle. However, even while on these medications, some women may experience irregularities in their menstrual cycle, including delayed periods.
In your case, a three-day delay in menstruation while taking birth control pills can be considered within the realm of normal. Many women may experience slight variations in their cycle due to factors such as stress, changes in weight, illness, or even the introduction of new medications. Since you mentioned that you are currently taking antibiotics, it’s worth noting that while most antibiotics do not affect the efficacy of birth control pills, certain stronger antibiotics can potentially reduce their effectiveness. This is particularly true for antibiotics like rifampin, which is not commonly prescribed. If you are on a different antibiotic, it is unlikely to have a significant impact on your birth control.

If your period does not arrive within a week, it is advisable to take a pregnancy test to rule out the possibility of pregnancy, especially if you have had unprotected intercourse. If the test is negative and your period still does not come, you may want to consult your healthcare provider for further evaluation. They can help determine if there are any underlying issues that need to be addressed.

Regarding your question about continuing to take your birth control pills, you should continue taking them as directed, regardless of whether your period has started. Birth control pills are typically taken continuously, and skipping doses can lead to further irregularities in your cycle. If you are in the middle of a pack and your period is delayed, continue taking the pills until you finish the pack. If you are due to start a new pack, you should do so as scheduled, even if your period has not arrived.

In summary, a three-day delay in your period while on birth control can be normal, especially when considering other factors like antibiotic use. Continue taking your birth control pills as prescribed, and consider taking a pregnancy test if your period does not arrive soon. If you have any concerns or if your cycle remains irregular, it’s best to consult with your healthcare provider for personalized advice and management.

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