What causes withdrawal bleeding after taking an ECP?

Question

Hello Doctor,

I had unprotected sexual intercourse and took a dose of Unwanted 72 (emergency contraceptive pill containing Levonorgestrel) within an hour. After taking the emergency contraceptive pill, I experienced withdrawal bleeding for several days, which I understand can be a common side effect. However, I have not yet had my regular menstrual period. Should I be concerned? Could this delay indicate a possible pregnancy?

Please help.

Answer 1

Hello,

Welcome to icliniq.com.

I understand your concern.

Unwanted 72, an emergency contraceptive pill containing Levonorgestrel, is most effective when taken within 72 hours of unprotected sexual intercourse, and you took it within one hour, so it was likely effective. A common side effect of this medication is withdrawal bleeding, which you experienced, indicating that your body responded to the hormone. However, this bleeding is not considered a regular menstrual period. Emergency contraception can disrupt your normal hormonal cycle, leading to delayed or irregular periods for up to four to six weeks. Although the risk of pregnancy is very low given the timely intake of the pill and the occurrence of withdrawal bleeding, emergency contraceptive pills are not 100% effective and have a failure rate of around one–two percent. Since it has been several weeks without your period, it is advisable to take a urine pregnancy test using the first-morning urine sample for the most accurate result. If the test is negative, the delay is likely due to hormonal changes from the pill. If the test is positive, you should consult a gynecologist immediately for further evaluation and care.

I hope you are satisfied with my answer. For further queries, you can consult me at icliniq.

Thank you.