Missed Birth Control Pill: Risks and Effects on Pregnancy - Obstetrics and Gynecology

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Missed taking birth control pills?


I have been taking 28 birth control pills for almost a year.
I forgot to take one on September 1 but didn't realize it.
I took my regular pill on September 2, and only on September 3 did I realize I missed a dose.
That day, I immediately took an extra pill (essentially taking two pills in one day).
Given this situation, is there still contraceptive effectiveness? If I had unprotected intercourse during this period, is there a possibility of pregnancy?

Tong, 10~19 year old female. Ask Date: 2021/09/05

Dr. Huang Yiwen reply Obstetrics and Gynecology


Hello Ms.
Tong: If you have taken the contraceptive pill, theoretically, the sooner you take it, the better.
Since it has been nearly 48 hours, the contraceptive effectiveness will be lower.
However, you don't need to worry too much, as there is still a certain level of contraceptive efficacy.
For now, you should just continue taking the pills for this cycle and wait for your next menstrual period to arrive.

Reply Date: 2021/09/05

More Info


When it comes to missed birth control pills, understanding the risks and effects on pregnancy is crucial for anyone relying on hormonal contraceptives for family planning. Birth control pills are designed to prevent ovulation, thicken cervical mucus, and thin the uterine lining to reduce the likelihood of pregnancy. However, missing a pill can disrupt this carefully balanced system.

In your case, you mentioned that you missed a pill on September 1st but resumed taking your pills on September 2nd and took two pills on September 3rd. This is a common scenario, and the immediate action of taking the missed pill as soon as you remember is the right approach. However, the effectiveness of the birth control pill can be compromised if pills are missed, especially if you have unprotected intercourse during that time.

According to the guidelines provided by most health organizations, if you miss one pill, you should take it as soon as you remember, even if it means taking two pills in one day. After taking the missed pill, continue taking the remaining pills as scheduled. In this case, since you resumed taking the pill promptly, you may still have some level of contraceptive protection, but it is important to consider the timing of unprotected intercourse.

If you had unprotected sex during the time you missed the pill, there is a possibility of pregnancy. The risk of pregnancy is higher if the missed pill was taken during the first week of your pill pack, as this is when your body is still adjusting to the hormones. If the missed pill occurred in the second or third week, the risk is somewhat lower, especially if you have been taking your pills consistently prior to the missed dose.

To assess your risk of pregnancy more accurately, consider the following factors:
1. Timing of Intercourse: If unprotected intercourse occurred within the week following the missed pill, the risk of pregnancy is higher.

2. Type of Birth Control Pill: Some birth control pills have a higher efficacy rate than others. Combination pills (which contain both estrogen and progestin) are generally more effective than progestin-only pills.

3. Follow-Up: If you are concerned about the possibility of pregnancy, consider taking a home pregnancy test if your period is late or if you experience any unusual symptoms.
4. Emergency Contraception: If you are worried about the risk of pregnancy and it has been less than 72 hours since unprotected intercourse, you may want to consider emergency contraception as an option.

5. Consultation with Healthcare Provider: If you have ongoing concerns or if you experience any unusual symptoms, it is advisable to consult with your healthcare provider for personalized advice and guidance.

In conclusion, while missing a birth control pill can increase the risk of pregnancy, taking the missed pill as soon as you remember and continuing with your regular schedule can help maintain contraceptive effectiveness. However, if you had unprotected intercourse during the time you missed the pill, there is a possibility of pregnancy, and it is important to monitor your situation closely. Always feel free to reach out to your healthcare provider for further clarification and support regarding your contraceptive methods and any concerns you may have.

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