U.S. doctors online nowAsk doctors free
A 21-year-old female asked:

Sex on the day before ovulation day. took a plan b on ovulation day (25 hours after sex) chances of pregnancy ?

1 doctor answer4 doctors weighed in
Dr. Lori Semel
Pediatrics 37 years experience
Low: Plan B can work in one of three ways depending on where you are in your cycle. It can prevent or delay ovulation, can interfere with the fertilization of the egg or may prevent implantation by altering the lining of the uterus. If you take Plan B One-Step within 24 hours, it is about 95% effective.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Apr 8, 2018


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.