Early Period While on Birth Control Pills: What You Need to Know - Obstetrics and Gynecology

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Taking oral contraceptive pills but experiencing menstruation two days early?


Hello! I started taking a 21-day pack of oral contraceptive pills in January.
My period came two days after finishing the first month's pills, but this month, after taking the 19th pill last night, I noticed dark red blood this morning.
Am I experiencing an early period? Why am I having a period while on the medication? I have been taking the pills consistently every day without missing any.
Should I continue taking the remaining 2 pills? Thank you for your response!

Chen, 20~29 year old female. Ask Date: 2020/02/27

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, if there is a little bleeding, continue taking the medication until it's finished.
If there is a lot of bleeding, similar to menstruation, stop the medication and observe how it goes next month when taking the medication, especially if it starts early.
Wishing you good health.

Reply Date: 2020/02/27

More Info


When it comes to taking birth control pills, experiencing unexpected bleeding can be concerning, especially if you are adhering to the regimen correctly. Let's break down your situation and provide some clarity on what might be happening.

Firstly, it’s important to understand how birth control pills work. The 21-day pill pack is designed to provide a steady dose of hormones that prevent ovulation and regulate your menstrual cycle. Typically, you take one pill every day for 21 days, followed by a 7-day break during which you either have a withdrawal bleed (similar to a period) or no bleeding at all. This withdrawal bleed usually occurs about two to three days after you finish the last pill in the pack.

In your case, you mentioned that you started your first pack in January and experienced your period two days after completing the 21 pills. This is a normal response to the hormonal changes induced by the pills. However, now that you are on your second pack and have noticed deep red bleeding after taking the 19th pill, this could be a few things.

1. Breakthrough Bleeding: This is common, especially in the first few months of starting a new birth control regimen. Breakthrough bleeding can occur due to hormonal fluctuations as your body adjusts to the new hormone levels. It’s not unusual to experience this bleeding even if you are taking your pills consistently.

2. Timing of the Bleed: Since you are still taking your pills and have not missed any doses, this bleeding may not be a sign of your period but rather breakthrough bleeding. It’s important to continue taking the remaining pills as scheduled. Stopping the pills prematurely could disrupt your cycle further.

3. Hormonal Adjustment: The body can take some time to adjust to the hormones in birth control pills. If you have recently started the pill, your body may still be adapting, which can lead to irregular bleeding patterns.

4. Consultation with a Healthcare Provider: If the bleeding continues or becomes heavy, or if you have any other concerning symptoms (such as severe pain or discomfort), it is advisable to consult with your healthcare provider. They can assess your situation more thoroughly and determine if any adjustments to your birth control method are necessary.

In summary, you should continue taking the remaining two pills in your pack as scheduled. Breakthrough bleeding is relatively common, especially in the early months of starting birth control pills. If you have any further concerns or if the bleeding persists, reach out to your healthcare provider for personalized advice.

In addition to understanding your current situation, it’s essential to be aware of the importance of consistent pill-taking. Missing doses or taking pills at irregular times can lead to unintended pregnancies or further irregularities in your cycle. If you ever miss a pill, follow the instructions provided with your medication or consult your healthcare provider for guidance on what to do next.

Lastly, if you are considering long-term birth control options or have concerns about side effects, discussing these with your healthcare provider can help you find the most suitable method for your needs.

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Dr. Cao Guotao reply Obstetrics and Gynecology
Hello, the bleeding could be related to stopping your birth control pills. It should be during your safe period, so the chances of pregnancy are low, so there's no need to worry. If the bleeding continues, you can take a hemostatic medication. Wishing you good health.

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