A 19-year-old female asked:
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period is late, i took plan b like a week ago is that why? just took a negative pregnancy test

1 doctor answer
Dr. Robert Kwok
32 years experience Pediatrics
Maybe: Plan B can alter the menstrual for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home pregnancy test about 3 weeks after sex (that's about 21 days after sex), because Plan B works most of the time, but not all the time.
Answered on Apr 4, 2015

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Related questions:

A 18-year-old female asked:
Dr. Robert Kwok
32 years experience Pediatrics
Tests are accurate: Plan B can alter the menstrual for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a home urine pre ... Read More
A 19-year-old female asked:
Dr. Parul Krishnamurthy
33 years experience Obstetrics and Gynecology
Can happen: Period may be delayed after using Plan B. Best to use consistent contraception to avoid such situations
1
1 thank
A 19-year-old female asked:
Dr. Tanya Russo
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Disrupted cycle: Your negative pregnancy test 8 days after a missed period is probably accurate. Most likely, the a plan B has temporarily disrupted your normal cycle ... Read More
A 25-year-old female asked:
Dr. Robert Kwok
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Hmmm....: There's nothing in the question that suggests something wrong with the body, but the brain attached to it decided to take Plan B twice in a week. If v ... Read More

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