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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Pregnancy Despite Taking Plan-B?

Hello, I was ovulating June 17th had unprotected sex and went to get plan b the next day around 330 pm. Intercourse happened around 1pm on the 17th. Here we are July 8th and I find out I am 5.4 weeks pregnant. What would be the reason the pill did not work?
Tue, 14 Jul 2020
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General & Family Physician,  's  Response
Hi,

Plan-B taken under 24 hours of unprotected sex is 95% potent. If it is taken under 25-48 hours of unprotected sex then it is said to be 85% effective. Hence, there is always a minor chance of pregnancy even after using emergency contraception.Combined oral pills give a success rate of about 99 percent when used regularly at the same time everyday and also without missing a pill.

Take care. Hope I have answered your question. Let me know if I can assist you further.

Regards,
Dr. Saranya Ramadoss, General & Family Physician
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What Causes Pregnancy Despite Taking Plan-B?

Hi, Plan-B taken under 24 hours of unprotected sex is 95% potent. If it is taken under 25-48 hours of unprotected sex then it is said to be 85% effective. Hence, there is always a minor chance of pregnancy even after using emergency contraception.Combined oral pills give a success rate of about 99 percent when used regularly at the same time everyday and also without missing a pill. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Saranya Ramadoss, General & Family Physician