Birth Control Pills and Menstrual Irregularities

Birth control pills and menstruation?

Hello Doctor, I have been taking the contraceptive pill (Yaz 24+4) for the past two months.
My menstrual periods were as follows: Period from April 26 to April 30, with the first pill taken on April 26, and the next period from May 22 to May 25, finishing the 28th pill on May 23.
Therefore, I started the new pack on the third day of my period (May 24).
This month, my period started on June 19, but as of today, June 28, I am still experiencing bleeding, although there were 2 days in between without menstruation.
I would like to ask the doctor: 1.
This month, I switched to a 21-pill contraceptive and started taking the first pill on the fifth day of my period (June 23).
I had sexual intercourse with ejaculation on June 25.
Is there a possibility of pregnancy? 2.
As of today, June 28, I am still experiencing light bleeding.
Does this mean my period has not ended, or could there be another issue? 3.
With the ongoing bleeding, is there still contraceptive effectiveness? If there is ejaculation, could I become pregnant? Thank you, Doctor.

Chen, 20~29 year old female. Ask Date: 2023/06/28

Dr. Cao Guotao reply Obstetrics and Gynecology

Hello, there is no possibility of pregnancy.
Continue taking the birth control pills until the end of the pack and observe if the same bleeding occurs next month.
If it does, consider trying a different brand of birth control pills.
Wishing you good health.

Reply Date: 2023/06/28

More Info

Hello! It seems you have several questions regarding the use of birth control pills and the irregularities you are experiencing with your menstrual cycle. Let's break down your concerns one by one.

1. Switching to a 21-day Birth Control Pill: You mentioned that you switched to a 21-day pill after using a 24+4 regimen. It's important to note that when switching birth control methods, especially in the middle of a cycle, there can be some irregularities in your menstrual cycle. Since you started the new pill on the fifth day of your period, you should be protected from pregnancy if you take the pill consistently. However, since you had unprotected intercourse on June 25, there is still a slight chance of pregnancy, especially if you did not use any backup contraception during the transition period. It’s generally recommended to use a backup method (like condoms) for the first seven days after starting a new pill.

2. Ongoing Light Bleeding: The light bleeding you are experiencing could be due to several factors. It may be a continuation of your menstrual cycle, or it could be breakthrough bleeding, which is common when starting or switching birth control pills. Breakthrough bleeding can occur as your body adjusts to the hormones in the new pill. If the bleeding is very light and not accompanied by severe pain, it is likely not a cause for concern. However, if it continues for an extended period or becomes heavy, it would be wise to consult your healthcare provider.

3. Effectiveness of Birth Control During Irregular Bleeding: Generally, if you are taking your birth control pills as directed, you should still have contraceptive protection, even if you are experiencing irregular bleeding. The hormones in the pill work to prevent ovulation and create an environment that is not conducive to pregnancy. However, if you miss any doses or take them inconsistently, the effectiveness can be compromised. If you are concerned about the possibility of pregnancy, consider taking a home pregnancy test if your next period is late or if you experience any unusual symptoms.

In summary, while it is possible to experience irregular bleeding when starting a new birth control method, it is usually not a cause for alarm. However, if you have any concerns about pregnancy or the nature of your bleeding, it is always best to consult with your healthcare provider for personalized advice and to ensure that your birth control method is working effectively for you. They can also help you address any side effects you may be experiencing and provide guidance on how to manage them.
Remember, maintaining open communication with your healthcare provider about your menstrual cycle and any changes you experience is key to managing your reproductive health effectively.

Similar Q&A

Understanding Birth Control Pills and Menstrual Irregularities

Hello, doctor. I have been taking oral contraceptives for over two years, specifically the brand Aisle. Around July, I started taking weight loss pills, which seemed to cause some menstrual irregularities, but it appeared to have returned to normal afterward. Here are my menstrua...

Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, if you finish taking the birth control pills and start again on the fifth day after your period begins, it is likely that you are not pregnant. Wishing you good health.

Taking Birth Control Pills Late: Effects on Your Menstrual Cycle

If you start the next pack of birth control pills two days late and begin taking them on the third day, will this cause your next menstrual cycle to be irregular?

Dr. Lin Wenbin reply Obstetrics and Gynecology
Menstrual irregularities are common.

Understanding Menstrual Irregularities After Birth Control Use

I took a box of oral contraceptive pills and after finishing it, I waited 7 days for my period to come, which it did. Then, I started the next box but only took 2 pills before stopping. About a week later, I started bleeding again, and the amount of blood is quite significant. Wh...

Dr. Zhang Kunmin reply Obstetrics and Gynecology
Hello, based on your description, it is necessary to have a physician evaluate whether there are any hormonal abnormalities, contraceptive failures, or other reasons. Thank you! Wishing you peace and health. Dr. Chang

Can Stopping Birth Control Pills Disrupt Menstrual Cycle?

Hello, doctor. I would like to ask a question. Can stopping the use of oral contraceptives cause irregular periods? My girlfriend has been taking them for three months and has temporarily stopped. She is concerned about potential side effects, and it has already been a month sinc...

Dr. Lin Manying reply Obstetrics and Gynecology
Emergency contraceptive pills can indeed cause menstrual irregularities and are not recommended as a long-term contraceptive method, as they may lead to infertility. If your period is already late, it is advisable to take a pregnancy test, as the effectiveness of contraceptive pi...