A member asked:

Chances of plan b failing taking 2 hrs after unprotected sex? took pregnancy test wk later, negative. chances test was wrong? paranoid. had 3 periods

4 doctors weighed in across 2 answers
Dr. Dennis Higginbotham answered

Specializes in American Board of Obstetrics and Gynecology

Small: Plan B has about a 98% efficacy when taken within the first 24 hours after unprotected sex. You are probably safe. It does take about 10 days for a pregnancy test to become positive so you should repeat the test after another week.

Answered 1/31/2015

3.5k views

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Dr. Eric Weisman answered

Specializes in Neurology

Not pregnant: You may need to see a doctor and have a blood based pregnancy test for piece of mind. Avoid unprotected sex for this and other reasons. Hang in there.

Answered 5/18/2016

3.5k views

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