Menstrual Regulation Medications: Your Questions Answered - Obstetrics and Gynecology

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Inquiry about menstrual regulation medications?


At the end of November, the condom broke during intercourse.
I took emergency contraception immediately and tested negative for pregnancy at the gynecology clinic on December 10.
The doctor prescribed me six doses of "Postinor" and "Yuzpe" regimen, taking two pills at a time, once in the morning and once in the evening.
I experienced withdrawal bleeding from December 7 to 12, and had a very small amount of brown discharge from January 5 to 8.
I would like to ask when I can expect my normal menstrual period to return after finishing all the menstrual regulation medication on January 30.
Is a pregnancy test taken 40 days after intercourse reliable? Thank you, doctor.

kk, 10~19 year old female. Ask Date: 2023/02/03

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it is normal to have your period within a week after stopping the contraceptive pill.
If you took a pregnancy test 12 days after intercourse and it was negative, it is likely that you are not pregnant.
Wishing you good health.

Reply Date: 2023/02/03

More Info


When it comes to menstrual regulation medications, understanding how they work and what to expect is crucial for managing your reproductive health. Based on your situation, it seems you have taken emergency contraception (the "morning-after pill") shortly after an incident of contraceptive failure, and you have also been prescribed medications to help regulate your menstrual cycle.

Firstly, it’s important to note that emergency contraception is designed to prevent pregnancy after unprotected intercourse or contraceptive failure. The effectiveness of these pills is highest when taken as soon as possible after the incident, and it appears you acted promptly by taking the medication within a day. The negative pregnancy test you received shortly after taking the emergency contraception is a good sign, indicating that you likely did not conceive.

The medications you were prescribed, such as "信通" (likely referring to a combination of hormones) and "益斯得" (which may be a form of hormonal therapy), are often used to help regulate menstrual cycles and can induce a withdrawal bleed, similar to a period. The timing of your next normal menstrual cycle can be influenced by several factors, including your hormonal balance, the timing of the medications, and your individual body response.

Regarding your question about when to expect your next period after completing the medications on January 30, it can vary. Generally, after stopping hormonal medications, it may take a few days to a couple of weeks for your body to adjust and for your menstrual cycle to return to its normal rhythm. Many women experience a withdrawal bleed within a week or two after stopping hormonal contraceptives, but this can vary widely. It’s not uncommon for some women to experience irregular cycles or delays in their periods after taking such medications, especially if they have recently used emergency contraception.

As for the timing of your pregnancy test, testing 40 days after the incident is generally considered reliable. Most home pregnancy tests are designed to detect pregnancy about one week after a missed period, which means testing 40 days post-incident should give you a clear indication of whether you are pregnant or not, assuming your cycle is regular. If your period does not arrive within a reasonable timeframe after completing the medications, it would be advisable to take another pregnancy test or consult your healthcare provider for further evaluation.

In summary, after completing your menstrual regulation medications, you can expect your period to return within a few weeks, but this can vary. If you have concerns about your menstrual cycle or if your period does not return as expected, it’s important to follow up with your healthcare provider. They can provide personalized advice based on your health history and current situation. Remember, hormonal treatments can affect each individual differently, and maintaining open communication with your healthcare provider is key to managing your reproductive health effectively.

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