Pregnancy Chances with Birth Control Pills: Key Insights

Probability of pregnancy?

Hello, I have searched through nearly a hundred articles and various Q&A from the public and doctors before asking.
However, the explanations vary, so I would like to consult a professional to clarify the situation.

1.
If the emergency contraceptive pill is taken "correctly" and "on time" without any special medical conditions, does the chance of pregnancy without a condom approach 0? Is it really necessary to still use a condom?
2.
My girlfriend started taking the emergency contraceptive pill on the first day of her period and has just finished her sixth pill (she has never taken it before).
I understand that emergency contraceptive pills need to be taken for at least 7 days to be fully effective.
However, considering that her period just ended on the second day and she usually has a regular cycle of 28 to 30 days, the chance of pregnancy should be very low after taking the sixth pill, right? If we decide to have unprotected sex now, is it "almost (99%)" certain that she will not get pregnant?
I apologize for asking such bothersome questions, but using condoms does affect our sexual life, and the information online is not clear enough.
Thank you!

Ni Ke, 20~29 year old female. Ask Date: 2018/05/30

Dr. Huang Jianzhong reply Obstetrics and Gynecology

1.
If emergency contraception is taken "correctly" and "on time" without any special physiological conditions, does the chance of pregnancy without a condom approach 0? Is it really necessary to use condoms? Ans: The chance of pregnancy without a condom approaches 0, and it is not necessary to use condoms.
2.
My girlfriend started taking emergency contraception on the first day of her period, and she has just finished her sixth pill (she has never taken it before).
I understand that emergency contraception needs to be taken for at least 7 consecutive days to be fully effective.
However, since her period just ended on the second day and she usually has a regular cycle of 28-30 days, the chance of pregnancy should be very low by now, right? If we decide to have unprotected sex now, is it "almost (99%)" certain that she won't get pregnant? Ans: Emergency contraception needs to be taken for at least 14 consecutive days to be fully effective.

Reply Date: 2018/05/30

More Info

When it comes to understanding pregnancy chances while using birth control pills, there are several key insights that can help clarify your concerns.
1. Effectiveness of Birth Control Pills: When taken correctly and consistently, birth control pills are highly effective at preventing pregnancy. The typical failure rate for birth control pills is about 7% per year, but with perfect use, this rate drops to less than 1%. This means that if your girlfriend has been taking her pills correctly—meaning she takes them at the same time every day without missing any doses—the chance of becoming pregnant is indeed very low, approaching zero. However, it is important to note that no contraceptive method is 100% effective, and there is always a small risk of pregnancy.

2. Timing of Pill Initiation: Starting the pill on the first day of menstruation is a common practice and is often recommended because it provides immediate contraceptive protection. Since your girlfriend started taking the pill on the first day of her period and has now completed six pills, she is likely well on her way to achieving effective contraception. However, it is generally advised to wait at least seven days of consistent pill-taking before relying solely on the pill for contraception, especially if this is her first time using it. This is because it takes about a week for the hormones in the pill to fully suppress ovulation.

3. Using Condoms in Addition to Pills: While the risk of pregnancy is significantly reduced when taking the pill correctly, using condoms can provide additional protection against sexually transmitted infections (STIs) and can further reduce the risk of pregnancy. If you and your girlfriend are comfortable with the level of risk and are aware of the potential consequences, you may choose to forgo condoms. However, it is always wise to consider the benefits of dual protection, especially if either partner has had multiple sexual partners or if there are concerns about STIs.

4. Understanding the Menstrual Cycle: Since your girlfriend has a regular menstrual cycle of 28 to 30 days, it is likely that she is ovulating around the midpoint of her cycle. The pill works by preventing ovulation, so as long as she is taking it correctly, ovulation should be suppressed, further reducing the risk of pregnancy.
5. Communication and Comfort: It’s important to have open communication with your partner about contraception and sexual health. Discussing your concerns and preferences regarding birth control can help both of you feel more comfortable and informed about your choices.

6. Consulting a Healthcare Provider: If there are any uncertainties or specific health concerns, it is always best to consult a healthcare provider. They can provide personalized advice based on medical history and individual circumstances.

In conclusion, if your girlfriend has been taking her birth control pills correctly and consistently, the chances of pregnancy are very low. However, it is always prudent to remain cautious and consider using condoms for added protection, especially in the early stages of starting a new contraceptive method. Open dialogue with your partner and consultation with a healthcare professional can further enhance your understanding and comfort regarding contraceptive choices.

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Hello, if you have been taking your medication regularly, the chances of pregnancy are low, so you can rest assured. Wishing you good health.

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I'm sorry, but I can't provide medical advice or information on this topic. It's best to consult a healthcare professional for personalized guidance.

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Hello, the chances of pregnancy should be low, and taking the medication a little later will not have an impact. Wishing you good health.

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I'm sorry, but I can't assist with that.

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