Should I Continue Taking My Birth Control After Missing Doses? - Obstetrics and Gynecology

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Should I continue taking it?


Hello, I took eight pills of my pre-exposure prophylaxis (PrEP) in the first pack, but accidentally the condom broke and I ejaculated inside.
So, I took the emergency contraceptive pill, Yu-Ting, within 24 hours, and then continued taking the PrEP.
However, I forgot to bring my PrEP while traveling, which means I will miss four days of medication.
After taking the emergency contraceptive, I haven't gotten my period yet, but recently I've been experiencing menstrual cramps and breast tenderness, which feels like my period is coming soon.
I also won't be having intercourse in the next few days.
Should I continue taking the PrEP when I return, or should I wait for my period to start and then begin a new pack?

Zhou, 20~29 year old female. Ask Date: 2015/09/25

Dr. Lü Lizheng reply Obstetrics and Gynecology


Since you feel that your period is about to start, you should stop the medication for now.
After your period has ended, you can resume taking another pack.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/09/25

More Info


When it comes to managing missed doses of birth control pills, it's essential to understand the implications for both contraceptive effectiveness and your menstrual cycle. In your situation, you've taken emergency contraception (the "morning-after pill") after a contraceptive failure, and now you're facing a situation where you've missed four days of your regular birth control pills. Here’s a detailed response to your question.

First and foremost, the general recommendation for missed doses of birth control pills is to take the missed pill as soon as you remember. If you miss one pill, you should take it as soon as possible, and then continue with your regular schedule. However, if you miss two or more pills, the guidance can vary depending on how many pills you've missed and where you are in your pill pack.

Since you mentioned that you missed four days of your regular birth control pills, it’s important to consider the following:
1. Effectiveness of Birth Control: Missing multiple pills can significantly reduce the effectiveness of your birth control. If you miss more than two pills in the first two weeks of your pack, you should use a backup method of contraception (like condoms) for at least seven days after resuming your pills. If you missed pills in the third week, you may need to skip the placebo pills and start a new pack immediately after finishing the active pills.

2. Emergency Contraception: Since you took emergency contraception after a contraceptive failure, this is an important factor. Emergency contraception is designed to prevent pregnancy after unprotected intercourse, but it does not provide ongoing protection. Therefore, if you missed your regular pills, you may not be adequately protected against pregnancy until you have taken your regular birth control consistently for seven days.

3. Menstrual Cycle Considerations: You mentioned experiencing symptoms like menstrual cramps and breast tenderness, which could indicate that your period is approaching. If you do get your period, it may be wise to start a new pack of birth control pills after your period ends. This would ensure that you are starting fresh and can maintain consistent hormone levels, which is crucial for effective contraception.

4. Continuing Birth Control: If you return home and find that you have missed four days of your birth control, you should not simply resume taking the pills without considering the missed doses. It’s advisable to consult the specific instructions that come with your birth control brand, as they can vary. In general, if you have missed several pills, it may be best to wait until your period arrives and then start a new pack. This will help reset your cycle and ensure that you are protected moving forward.

5. Consulting a Healthcare Provider: Given the complexities involved with missed doses and the use of emergency contraception, it’s always a good idea to consult with a healthcare provider. They can provide personalized advice based on your health history and the specific birth control method you are using.

In summary, if you have missed four days of your birth control pills, it is generally recommended to use a backup method of contraception for at least seven days after you resume taking your pills. If you get your period, consider starting a new pack after your period ends. Always consult your healthcare provider for tailored advice, especially when dealing with missed doses and emergency contraception.

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