What is the reason for delayed menstruation by 7 days after taking birth control pills?

Patient's question:

I took birth control pills last week, and now my period is delayed for the seventh day. It's just that my abdomen hurts. What's going on?

Doctor's answer:

After taking emergency contraception pills, not everyone will experience delayed bleeding. Lower abdominal pain could be a symptom before menstruation, or it might be a recurring adverse reaction from taking emergency contraception pills. It is recommended that you always use contraception measures during sexual activity in the future and do not take emergency contraception pills casually to avoid menstrual disorders and recurring adverse reactions similar to pregnancy symptoms. You can supplement your diet with collagen-rich foods such as fresh milk, eggs, and fish skin. Avoid spicy foods.

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