Can You Get Pregnant While Taking Menstrual Delay Medication? - Obstetrics and Gynecology

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Hello doctor, my last menstrual period started on September 28.
I will be traveling abroad from November 2 to November 7, and I started taking menstrual delay medication on October 26.
I would like to know if having unprotected sex during my trip could easily lead to pregnancy.
Thank you.

Wan Wan, 20~29 year old female. Ask Date: 2019/10/27

Dr. Huang Jianzhong reply Obstetrics and Gynecology


The last menstrual period started on September 28, and I will be traveling abroad from November 2 to November 7.
I began taking menstrual delay medication on October 26.
Is it likely to get pregnant if I engage in unprotected sexual intercourse during my trip? Answer: It is unlikely to get pregnant.

Reply Date: 2019/10/27

More Info


When considering the use of menstrual delay medication and its implications for pregnancy, it's essential to understand how these medications work and their potential effects on your menstrual cycle and fertility.

Menstrual delay medications, often containing hormones such as norethisterone, are designed to postpone menstruation. They work by altering the hormonal signals that regulate the menstrual cycle, effectively delaying the shedding of the uterine lining. While these medications can be effective in postponing your period, they do not provide contraception. Therefore, if you engage in unprotected sexual intercourse while taking these medications, there is still a possibility of becoming pregnant.

In your case, since you started taking the menstrual delay medication on October 26 and your last menstrual period began on September 28, you are likely in a phase where your body is responding to the hormonal changes induced by the medication. If you have unprotected sex during this time, there is a risk of pregnancy, especially if you have not been using any form of contraception. The timing of ovulation is crucial here; if you ovulate during the time you are taking the medication, and sperm is present, fertilization can occur.

It's also important to note that the effectiveness of menstrual delay medications can vary from person to person. Some women may experience breakthrough bleeding or irregularities in their cycle even while taking these medications. If you are concerned about the possibility of pregnancy, it is advisable to use additional contraceptive methods, such as condoms, while taking menstrual delay medication.

In summary, while menstrual delay medications can effectively postpone your period, they do not prevent pregnancy. If you engage in unprotected sexual intercourse during this time, there is a risk of becoming pregnant. If you are actively trying to avoid pregnancy, it is crucial to use reliable contraception in conjunction with any hormonal medications. If you have further concerns or questions about your specific situation, consulting with a healthcare provider is recommended for personalized advice and guidance.

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