Experiencing Early Period Symptoms While on Birth Control Pills? - Obstetrics and Gynecology

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Took emergency contraception but suspect an early onset of menstruation?


Your girlfriend has been taking oral contraceptive pills for contraception and is currently in her second week.
However, she occasionally forgets to take them and takes a missed dose the next day.
Now, she is experiencing abdominal pain and symptoms resembling menstrual bleeding.
Is this normal?

Xiang, 20~29 year old female. Ask Date: 2015/10/19

Dr. Lü Lizheng reply Obstetrics and Gynecology


If contraceptive pills are not taken regularly, the hormones received by the body (from the contraceptive pills) can become unstable, leading to irregular menstruation.
This may result in breakthrough bleeding, which can cause uterine contractions and abdominal pain.
It is recommended to take contraceptive pills consistently to avoid similar issues in the future.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/10/19

More Info


Experiencing symptoms that resemble a menstrual period while on birth control pills can be concerning, especially for someone who is just starting the regimen. It's important to understand how birth control pills work and what side effects may occur during the initial weeks of use.

When a person starts taking birth control pills, especially if they are new to hormonal contraception, it is common to experience various side effects as the body adjusts to the hormones. These side effects can include abdominal cramps, spotting, or breakthrough bleeding, which may feel similar to a menstrual period. This is particularly true in the first few months of starting the pill, as the body is adapting to the new hormone levels.

If your girlfriend is in her second week of taking the pill and is experiencing abdominal pain and what appears to be menstrual bleeding, this could be a normal response to the hormonal changes. However, there are a few important considerations to keep in mind:
1. Missed Pills: If she occasionally forgets to take her pills and then takes them the next day, it can disrupt the hormone levels and lead to breakthrough bleeding. It's crucial to take the pill at the same time every day to maintain consistent hormone levels.

2. Breakthrough Bleeding: This is a common occurrence, especially during the first few months of starting the pill. It can happen due to the body adjusting to the hormones, and it usually resolves itself as the body gets used to the medication.

3. Pregnancy Risk: If pills are missed or taken inconsistently, there is a risk of pregnancy. If your girlfriend experiences symptoms such as severe abdominal pain, missed periods, or other unusual symptoms, it may be wise to take a pregnancy test to rule out this possibility.

4. Consulting a Healthcare Provider: If the symptoms persist or worsen, or if there are any concerns about the bleeding or pain, it is advisable for her to consult with a healthcare provider. They can provide personalized advice and determine if any further action is necessary.

5. Understanding the Pill: It's important to remember that birth control pills work by preventing ovulation, thickening cervical mucus, and thinning the uterine lining. If taken correctly, they are highly effective at preventing pregnancy. However, side effects can vary widely among individuals.

In summary, experiencing symptoms that resemble a menstrual period while on birth control pills, especially in the early weeks, can be a normal part of the adjustment process. However, consistent pill-taking is crucial for effectiveness, and any persistent or severe symptoms should be discussed with a healthcare provider to ensure everything is on track.

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