Emergency Contraceptives and Ovulation Test Results - Obstetrics and Gynecology

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Emergency contraceptive pills and strong positive results on ovulation test strips?


Hello, doctor.
I would like to inquire about my menstrual cycle.
I usually have a regular cycle of 28-30 days, with an average duration of 5 days.
However, since I started taking the contraceptive pill (Aivee) a month and a half ago, I have noticed some changes.
I began taking the pill on the first day of my period on May 11.
The duration of my bleeding has extended to 9 days.
I had unprotected intercourse on the 5th and 9th days of taking the pill.
At the end of the first pack, my period did not arrive as expected, and I took a pregnancy test on June 20, which was negative.
However, today (June 24), I used an ovulation test, which showed a strong positive result, and I am experiencing breast tenderness and increased discharge.
Is this situation common? Additionally, I would like to know if I really need to supplement with vitamin C, and how long should I wait after taking the contraceptive pill before taking vitamin C supplements to avoid any interactions?

Niming, 30~39 year old female. Ask Date: 2024/06/24

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it is normal not to ovulate.
Typically, you should expect your period to arrive within a week after finishing the birth control pills.
Just monitor your situation; it is not necessary to take health supplements.
Wishing you good health.

Reply Date: 2024/06/24

More Info


Understanding the complexities of emergency contraceptives and ovulation test results is crucial for anyone navigating their reproductive health. Based on your description, it seems you have been using a hormonal contraceptive (likely a combined oral contraceptive pill) for about a month and a half, and you are experiencing some changes in your menstrual cycle and ovulation indicators.

Firstly, it's important to understand that hormonal contraceptives can significantly alter your menstrual cycle. When you start taking a contraceptive pill, it can take some time for your body to adjust to the hormones. This adjustment period may lead to changes in the timing and duration of your menstrual bleeding. In your case, the extension of your bleeding to nine days could be a side effect of starting the pill, especially since you mentioned this is your first time using it.

Regarding the unprotected intercourse you had during the first month of taking the pill, it's essential to note that most hormonal contraceptives require consistent use for at least seven days before they are considered effective at preventing pregnancy. Since you started taking the pill on the first day of your menstrual cycle, you should have been protected after the initial week of use. However, if you missed any doses or took them irregularly, this could affect the pill's efficacy.

The negative pregnancy test on June 20 indicates that you were likely not pregnant at that time. However, the strong positive result on the ovulation test on June 24 suggests that your body is experiencing a surge in luteinizing hormone (LH), which typically occurs just before ovulation. This can happen even if you are on hormonal contraceptives, particularly if your body is adjusting to the new hormone levels. Some women may experience breakthrough ovulation while on the pill, especially during the initial months of use.

As for the breast tenderness and increased discharge you are experiencing, these can also be side effects of hormonal changes due to the contraceptive pill or signs of approaching ovulation. It's not uncommon for women to experience these symptoms, especially when their bodies are adjusting to new hormonal levels.

Regarding your question about vitamin C supplements, there is no significant evidence to suggest that vitamin C interacts negatively with hormonal contraceptives. However, it is always a good practice to space out the intake of supplements and medications to avoid any potential interactions. A general recommendation is to take supplements at least two hours apart from your contraceptive pill to ensure optimal absorption and efficacy.

In summary, your experiences with the contraceptive pill and ovulation test results are not unusual, especially during the initial adjustment period. If you have any concerns about your menstrual cycle, the effectiveness of your contraceptive method, or any potential interactions with supplements, it is advisable to consult with your healthcare provider. They can provide personalized advice based on your health history and current situation.

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