2 doctors weighed in:

If my girlfriend had a one day "period" 5 days after taking Take Action EC pill does that mean she is not pregnant? Or will next period only tell?

2 doctors weighed in
Dr. Robert Kwok
Pediatrics
1 doctor agrees

In brief: Maybe

An emergency contraception pill (EC pill, such as Plan B) can alter the menstrual bleeding for the cycle in which the EC pill was taken, and sometimes the next cycle too.
One should check a home pregnancy test about 3 weeks after sex, because EC pills work most of the time, but not all the time. Without a test, one can be pretty sure there is no pregnancy if the second period looks very NORMAL.

In brief: Maybe

An emergency contraception pill (EC pill, such as Plan B) can alter the menstrual bleeding for the cycle in which the EC pill was taken, and sometimes the next cycle too.
One should check a home pregnancy test about 3 weeks after sex, because EC pills work most of the time, but not all the time. Without a test, one can be pretty sure there is no pregnancy if the second period looks very NORMAL.
Dr. Robert Kwok
Dr. Robert Kwok
Thank
Get help from a real doctor now
Dr. Dennis Higginbotham
Board Certified, Obstetrics & Gynecology
27 years in practice
49M people helped
Continue
111,000 doctors available
Read more answers from doctors