Do I Need Emergency Contraception After Unprotected Sex? - Obstetrics and Gynecology

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After engaging in unprotected sex, the question of whether to take emergency contraception (EC) is a common concern, especially when there is a possibility of pregnancy. In your case, since you had unprotected intercourse on December 11 and your girlfriend's menstrual period started on December 13, it is important to consider a few factors.

Firstly, the timing of her menstrual cycle is crucial. If her last period started on November 27, and her cycle is regular (typically 28 days), she would have been expected to ovulate around December 11, which is the time you had unprotected sex. However, if her period started on December 13, it indicates that she likely was not in her fertile window at the time of intercourse, as ovulation typically occurs about 14 days before the start of the next period. Therefore, the chances of her becoming pregnant from the December 11 encounter are relatively low.

Regarding the use of emergency contraception, it is generally recommended to take it within 72 hours after unprotected intercourse for it to be most effective. However, since your girlfriend's period has started, it is likely that she is not pregnant. Taking emergency contraception at this point may not be necessary and could potentially disrupt her menstrual cycle.

It is also important to note that if your girlfriend has a history of taking abortion pills, it is essential to ensure that she is aware of the implications and potential side effects of any medication she takes. If there are any uncertainties about her menstrual cycle or the possibility of pregnancy, it may be beneficial for her to consult with a healthcare provider for personalized advice.

In summary, based on the information provided, it seems that taking emergency contraception is not necessary since your girlfriend's period has started. However, if there are any concerns or if her menstrual cycle is irregular, it would be wise to consult a healthcare professional for further evaluation and guidance. Additionally, for future sexual encounters, consider discussing and implementing more reliable contraceptive methods to prevent unintended pregnancies and reduce the risk of sexually transmitted infections (STIs).