Can You Get Pregnant While on Birth Control Pills? - Obstetrics and Gynecology

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Yes, it is possible to get pregnant while on birth control pills, although the chances are significantly reduced when the pills are taken correctly. Birth control pills, particularly combination pills that contain both estrogen and progestin, work primarily by preventing ovulation. They also thicken cervical mucus, making it more difficult for sperm to reach an egg, and thin the uterine lining to prevent implantation. However, several factors can affect their efficacy.

1. Adherence to the Regimen: It is crucial to take the pill at the same time every day. Missing doses or taking them inconsistently can lead to ovulation and increase the risk of pregnancy. If you started taking the pill on the second day of your period and have been consistent, you should be protected from pregnancy after seven consecutive days of taking the pills.

2. Drug Interactions: Certain medications can interfere with the effectiveness of birth control pills. For example, some antibiotics, anti-seizure medications, and herbal supplements like St. John's Wort can reduce the pill's effectiveness. Since you mentioned taking "樂命達" (Lamectil, which is Lamotrigine), it is essential to consult with your healthcare provider about potential interactions with your birth control pills.

3. Gastrointestinal Issues: If you experience vomiting or severe diarrhea shortly after taking the pill, it may not be fully absorbed, which can lead to reduced effectiveness.

4. Timing of Intercourse: The timing of intercourse in relation to your menstrual cycle can also play a role. If you had unprotected intercourse shortly after starting the pill, there is a lower risk of pregnancy, especially if you have been taking the pills correctly.

Regarding the green, thick discharge you mentioned, this could be due to several factors, including hormonal changes from the birth control pills, an infection, or other medical conditions. It is not a typical sign of pregnancy, but if you are concerned, especially since it is accompanied by other symptoms, it would be wise to consult a healthcare professional for a thorough evaluation.

In summary, while the risk of pregnancy while on birth control pills is low if taken correctly, it is not zero. If you have concerns about potential pregnancy or unusual symptoms, it is best to take a pregnancy test and consult with your healthcare provider for personalized advice and management. They can provide guidance based on your specific situation, including any interactions with your other medications.