Will taking emergency contraception delay ovulation and affect the calculation of the safe period?

Patient's question:

According to the safe period calculation method, I should be ovulating around the 14th of this month. On the 18th morning, I had sexual intercourse without any form of contraception, and afterwards, I took an emergency contraceptive pill. On the 22nd, I had sexual intercourse without any form of contraception (normally, the 22nd would already be the safe period). I don't know if taking the emergency contraceptive pill will delay ovulation. Please reply from an expert!

Doctor's answer:

Hello: According to the potential impact of emergency contraception on normal menstruation, affecting menstruation can also affect normal ovulation. The safe period is not absolutely safe, and there is still a possibility of pregnancy. If you do not want to get pregnant too early, you should take contraceptive measures for normal sexual intercourse.

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