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How long can this pill delay my period ?

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I took next choice 10 hours after sex using coitus interruptus. It was nearby my ovulation time. This happened 2 weeks ago and I am suppose to get my period now. How long can this pill delay my period if effective? I have breast pain now, so I am not sure if I should be worry. Thnaks

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replied March 22nd, 2011
Birth Control Answer A21101

Welcome to ehealthforum

Emergency contraceptive pills are quite effective if taken within 72 hours and chances of pregnancy are rare.They cause alteration in the hormonal levels and thus delay the periods.If the periods do not start within a week of the due date then get a Blood HCG test done for pregnancy determination.
Kindly see a Gynaecologist for evaluation.

Take Care!

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