Emergency Contraceptive Pills: Pregnancy Risks After Use

Emergency contraceptive pill

You had sexual intercourse with your girlfriend on September 3rd and she took emergency contraception the next day.
Her menstrual cycle is usually regular and she typically gets her period in early to mid-September, but it hasn't arrived yet.
What is the likelihood of pregnancy?

Nìmíng, 10~19 year old female. Ask Date: 2015/09/17

Dr. Lü Lizheng reply Obstetrics and Gynecology

The emergency contraceptive pill can prevent about 80% of pregnancies, but there is still a possibility of becoming pregnant.
If your period is significantly delayed, it is recommended to take a pregnancy test for confirmation.
Sincerely, Dr.
Li-Cheng Lu, Taoyuan Hospital.

Reply Date: 2015/09/17

More Info

Emergency contraceptive pills (ECPs), commonly known as "morning-after pills," are designed to prevent pregnancy after unprotected intercourse or contraceptive failure. They are most effective when taken as soon as possible after the event, ideally within 72 hours, but some types can be taken up to 120 hours later. The two main types of ECPs are those containing levonorgestrel and those containing ulipristal acetate.
In your case, since your girlfriend took the emergency contraceptive pill the day after unprotected intercourse, it is likely that the pill has effectively reduced the risk of pregnancy. However, it is important to note that no contraceptive method is 100% effective, and the effectiveness of ECPs can be influenced by several factors, including the timing of administration in relation to ovulation and the individual's menstrual cycle.

Regarding your concern about the delay in her menstrual cycle, it is not uncommon for ECPs to cause changes in menstrual patterns. Some women may experience an earlier or later onset of their next period, and the flow may be lighter or heavier than usual. If her period is significantly delayed beyond a week from the expected date, it would be advisable for her to take a home pregnancy test to confirm whether or not she is pregnant.
If the test is positive, it is essential to consult a healthcare provider for further evaluation and guidance. If the test is negative and her period still does not arrive, she should also consult a healthcare provider, as there may be other underlying factors affecting her menstrual cycle.

In summary, while the use of emergency contraceptive pills significantly reduces the risk of pregnancy after unprotected intercourse, it is not infallible. The delay in her menstrual cycle could be a side effect of the ECP, but if her period does not arrive soon, taking a pregnancy test is the best course of action. If there are any concerns or unusual symptoms, seeking medical advice is always recommended.

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