Why Am I Still Pregnant After Taking Birth Control? - Obstetrics and Gynecology

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Why can pregnancy still occur?


Doctor, I had intercourse with my boyfriend after my menstrual cycle, but I was secretly taking birth control pills.
Why did I still get pregnant? I was unaware of my pregnancy and consumed alcohol during that time, approximately two weeks into the pregnancy.
Will this affect the baby? Can I still carry this baby to term?

Mi Er, 20~29 year old female. Ask Date: 2006/03/01

Dr. Dai Qihan reply Obstetrics and Gynecology


Your issue cannot be resolved online; it is advisable to visit a nearby gynecology clinic for an examination.

Reply Date: 2006/03/01

More Info


It’s understandable to feel anxious and concerned about the possibility of pregnancy despite taking birth control. Birth control methods, while generally effective, are not foolproof. There are several reasons why you might still become pregnant even when using contraceptives.

Firstly, it's important to consider the type of birth control you were using. Some methods, such as oral contraceptive pills, require strict adherence to the schedule of taking them daily. Missing a dose or taking them at inconsistent times can significantly reduce their effectiveness. Additionally, certain medications or supplements can interact with birth control pills, diminishing their effectiveness. For example, antibiotics and some herbal supplements like St. John's Wort can interfere with hormonal contraceptives.

Secondly, if you had unprotected intercourse during your fertile window, which is typically around ovulation, the chances of conception increase. The menstrual cycle can vary greatly among individuals, and sometimes ovulation can occur earlier or later than expected, leading to unplanned pregnancies.

Regarding your concern about drinking alcohol shortly after conceiving, it’s crucial to understand that alcohol consumption during early pregnancy can pose risks to fetal development. The first trimester is a critical period for the development of the baby’s organs and systems. While the exact effects of alcohol on a developing fetus can vary, consuming alcohol during this time can lead to fetal alcohol spectrum disorders (FASD), which can result in physical, behavioral, and learning problems.

If you suspect you are pregnant, it is advisable to take a home pregnancy test or consult a healthcare provider for confirmation. If the test is positive, it’s essential to schedule an appointment with your healthcare provider to discuss your pregnancy and any concerns you may have, including your alcohol consumption. They can provide guidance on the next steps and any necessary prenatal care.

As for your question about whether you can still have a healthy pregnancy and baby, many women have successfully carried pregnancies to term after consuming alcohol in early pregnancy. However, the key is to stop drinking as soon as you find out you are pregnant and to seek medical advice. Your healthcare provider can monitor the pregnancy and provide support to ensure the best possible outcome for both you and your baby.

In conclusion, while birth control methods are effective, they are not infallible. If you find yourself in a situation where you suspect you may be pregnant, it’s essential to take a pregnancy test and consult with a healthcare professional. They can help you navigate your concerns about alcohol consumption and provide the necessary support for a healthy pregnancy. Remember, early and regular prenatal care is vital for the health of both you and your baby.

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