the Risks of Unprotected Sex During Menstruation - Obstetrics and Gynecology

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Menstrual intercourse


I got my period on October 10th, and on the fifth day, I had intercourse using a condom, which ended up breaking.
My menstrual cycle has never been shorter than 28 days, but it has been irregular.
I would like to know the likelihood of pregnancy and whether it is necessary to take emergency contraception.

M, 10~19 year old female. Ask Date: 2019/10/17

Dr. Huang Jianzhong reply Obstetrics and Gynecology


This month, my period started on October 10th.
On the fifth day, I used a condom during intercourse, but it broke.
My menstrual cycle has never been shorter than 28 days, although it hasn't been very regular.
I would like to know the likelihood of pregnancy and whether it is necessary to take emergency contraception.
Answer: The likelihood of pregnancy is low, but taking emergency contraception is a precaution.

Reply Date: 2019/10/17

More Info


Engaging in sexual activity during menstruation can raise concerns regarding the risk of sexually transmitted infections (STIs) and unintended pregnancies, especially when protection is compromised, such as with a broken condom. In your case, since you mentioned that the condom broke while you were having sex on the fifth day of your menstrual cycle, it's important to assess the risks involved.

Firstly, let's address the risk of pregnancy. The likelihood of becoming pregnant during menstruation is generally lower than at other times in the menstrual cycle, particularly if you have a regular cycle of around 28 days. Ovulation typically occurs around 14 days after the first day of your last period, meaning that the fertile window is usually in the middle of your cycle. However, sperm can live inside the female reproductive tract for up to five days, so if you have a shorter cycle or if you ovulate earlier than expected, there is still a possibility of pregnancy. Given that your cycle is usually stable and does not fall below 28 days, the risk of pregnancy from intercourse on the fifth day of your period is relatively low, but not zero.

Regarding the use of emergency contraception (the "morning-after pill"), it is generally recommended if unprotected intercourse occurs or if a condom fails. Since the condom broke, taking emergency contraception could be a prudent choice, especially if you have any doubts about the timing of your ovulation or if you want to minimize the risk of unintended pregnancy. Emergency contraception is most effective when taken as soon as possible after unprotected intercourse, ideally within 72 hours, but some forms can be effective up to five days later.

Now, let's discuss the risk of STIs. Engaging in sexual activity during menstruation can increase the risk of transmitting infections, as menstrual blood can carry pathogens. If either partner has an STI, the risk of transmission may be heightened during this time. The broken condom also raises concerns, as it could expose you to any infections that your partner may have, even if they are asymptomatic. It's important to consider getting tested for STIs if you have concerns about potential exposure, especially since many STIs can be asymptomatic.

In summary, while the risk of pregnancy from having sex during your period is lower, it is not entirely absent, particularly with a broken condom. Taking emergency contraception is advisable if you want to reduce the risk of unintended pregnancy. Additionally, consider getting tested for STIs to ensure your sexual health and peace of mind. Regular check-ups and open communication with your partner about sexual health are essential for maintaining a healthy sexual relationship.

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