A 19-year-old female asked:
Period is late, i took plan b like a week ago is that why? just took a negative pregnancy test
1 doctor answer • 3 doctors weighed in
Pediatrics 33 years experience
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.
3k viewsReviewed >2 years ago
Last updated Apr 4, 2015
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
24/7 visits - just $39!
50% off with $15/month membership
Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.