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A 21-year-old female asked:

Hello i was supposed to start my period today but i didn't. i took a plan b pill 2 weeks ago and had unprotected sex three days before my period. my b?

1 doctor answer1 doctor weighed in
Dr. Robert Kwok
Pediatrics 35 years experience
About Plan B...: Plan B can alter the menstrual-type bleeding 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, because Plan B works most of the time, but not all the time.
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Related questions

A 16-year-old female asked:
Hi! I am a 16 y/o girl and I have been getting my period for about three years. I had unprotected sex about a week ago and today my period showed up two weeks early. I took Plan B the morning after we had sex.
Dr. Jeff Livingston
Obstetrics and Gynecology 24 years experience
Typical with Plan B: Plan b essentially disrupts the normal menstrual cycle by blocking or delaying ovulation. That it is how it works and why it is so different than a me... Read More
Created for people with ongoing healthcare needs but benefits everyone.
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Hello. I was 6 days late getting my period, I then had unprotected sex so I took a plan b pill. The same day I started bleeding and have been for 3 da?
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Created for people with ongoing healthcare needs but benefits everyone.
A 22-year-old female asked:
First month of Junel fe 1/20, on the last active pill day had unprotected sex. Took plan B the next day and haven't gotten my period 4 days later. ?
Dr. Robert Kwok
Pediatrics 35 years experience
About Plan B...: Plan B can alter the menstrual-type bleeding for the cycle in which Plan B was taken, and sometimes the next cycle too. One should be sure to check a ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old female asked:
Hello well my quiestion is should i be worried or not i had unprotected sex with my boyfriend on the 21of feb.on a friday i took a plan b that night but had sex again the following day thats saturday and didnt take any pill but had my period on sunday af
Dr. Douglas Lawson
Obstetrics and Gynecology 30 years experience
Hmmmm: The bleeding you had that sunday could have been from the plan b and not your period. Two things to consider here. One is that you should check a pr... Read More
Created for people with ongoing healthcare needs but benefits everyone.
View all answers
A 19-year-old female asked:
I had a 1day heavy period &3spotting days. Can that be a result of the Plan B pill ? Should i be worried. I took it an hour after unprotected sex
Dr. Jane Van Dis
Obstetrics and Gynecology 20 years experience
Likely okay: The fact that you took the Plan B 1 hour after unprotected sex is about as good of prevention of pregnancy as possible using that method. Your period ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
View all answers
Last updated Apr 13, 2017

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