Birth Control Pills: Common Concerns and Answers - Obstetrics and Gynecology

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Contraceptive pill issues


Hello, Doctor.
I have been taking the 21-tablet emergency contraceptive pill, Dailian, since August of last year, and it has been about six months without any major issues.
Both my doctor and pharmacist have advised me to start a new pack on the fifth day of my menstrual cycle each month, and I have been maintaining this habit.
However, I have some recent concerns:
1.
It seems that the timing of my period after finishing the pills is getting later.
In the first three months, my period started around the third day, but in the last two months, it has shifted to the fourth day, and sometimes it even starts late at night on the fourth day.
Should I be concerned about this, or can I continue taking the pills as usual?
2.
Following up on the previous question, if my period is delayed by 5-6 days after finishing the pills next month, is that normal? Should I still maintain the routine of starting a new pack on the fifth day of my period? Will this affect the contraceptive effectiveness?
3.
Recently, I have noticed that the volume of my menstrual flow has gradually decreased and become thicker.
Is this normal?
Thank you for your assistance in clarifying these concerns.

An An, 20~29 year old female. Ask Date: 2023/02/16

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, everything is considered normal.
Generally, it will occur within a week after taking the medication.
Wishing you good health.

Reply Date: 2023/02/16

More Info


Understanding birth control pills, particularly the combined oral contraceptive pills like Dailian, is essential for women who rely on them for contraception and menstrual regulation. Your concerns about the timing of your menstrual cycle, the effects of the pills, and changes in menstrual flow are common among users. Let’s address your questions one by one.

1. Delayed Menstrual Onset: It is not uncommon for women taking birth control pills to experience changes in their menstrual cycle. The timing of your period can vary due to several factors, including hormonal adjustments, stress, changes in weight, or even lifestyle changes. If your period is arriving later than before, it is generally not a cause for concern as long as you are taking your pills consistently and correctly. The hormonal regulation provided by the pills can lead to variations in cycle timing. As long as you are adhering to the prescribed regimen, you can continue taking the pills as directed.

2. Significant Delay in Menstrual Cycle: If you find that your period is delayed by 5-6 days after completing your pack, it is still within the realm of normal for some women. However, if you experience a significant delay or miss your period entirely, it may be wise to take a pregnancy test to rule out pregnancy, especially if you have missed any doses or taken the pills inconsistently. Regardless of the timing of your period, you should continue to take your new pack of pills on the scheduled day (the fifth day after your last pill). The effectiveness of the pill as a contraceptive method remains intact as long as you take it consistently, regardless of menstrual irregularities.

3. Changes in Menstrual Flow: It is also common for women to notice changes in the volume and consistency of their menstrual flow while on birth control pills. Many women report lighter periods, and some may experience a reduction in the duration of their bleeding. The thickening of menstrual blood can occur due to hormonal changes induced by the pill, which can lead to a lighter and less painful menstrual experience. This is generally considered a positive effect of the pill, as it can reduce menstrual cramps and other symptoms associated with menstruation.

In summary, the changes you are experiencing—delayed periods, variations in menstrual flow, and changes in blood consistency—are not unusual for women on hormonal contraceptives. It is crucial to maintain open communication with your healthcare provider about any significant changes or concerns you may have. If you have further questions or if your symptoms change significantly, consider scheduling a visit with your doctor for personalized advice and reassurance.

Additionally, it’s important to remember that while birth control pills are effective in preventing pregnancy, they do not protect against sexually transmitted infections (STIs). If you have concerns about STIs or other reproductive health issues, discussing these with your healthcare provider is essential for comprehensive care.
Maintaining a healthy lifestyle, including regular exercise, a balanced diet, and managing stress, can also positively influence your menstrual health while on birth control. Always consult with your healthcare provider before making any changes to your medication regimen or if you have any health concerns.

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