Does taking emergency contraception pills increase menstrual flow?

Patient's question:

Doctor, I would like to ask if taking emergency contraception pills can cause the menstrual blood flow to increase continuously? Here's the situation: On the first day in the morning, I had sex with my boyfriend, and then, for some reason, the condom broke. It was only when he was about to ejaculate that we noticed it was broken. We then bought and took emergency contraception pills. But then we realized that the condom had broken. We thought it was because I was too dry, so we didn't pay much attention. Later, we confirmed that it was my period, but by then, the pills had already been taken. After taking the pills, I didn't experience any nausea or vomiting. However, my menstrual blood flow has been more than usual. My period usually lasts about four days, and by the fourth day, it was almost over. But now, on the fourth day, the menstrual blood is still abundant, even more than the first two days. Doctor, is this because of the emergency contraception pills I took? Or is there another reason? In this situation, is it possible that I might be pregnant?

Doctor's answer:

If you have had intercourse again during the premenstrual period, the possibility of pregnancy is unlikely. Currently, the heavy menstrual flow you are experiencing is likely related to the side effects of taking emergency contraception. If you are indeed experiencing excessively heavy menstrual bleeding, you may consider taking medication for treatment, such as Gongxuening. If the condition does not improve, it is recommended that you seek medical attention promptly to determine the cause.

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