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A female asked:

my period has never been normal,but use a period tracker app to keep track, i had sex one day after ovulation, and took plan b 72 hours after that?

3 doctor answers7 doctors weighed in
Dr. Dale Kristle
Gynecology 40 years experience
Usually effective: check a pregnancy test if your period is late and start using contraception!
Dr. Mary David
Specializes in Obstetrics and Gynecology
Sooner: It should be 87-89% effective in preventing pregnancy. It is 95% effective if taken within 24 hr. after unprotected intercourse so the sooner you take it the better it works. Hope this helps. Try mot to put yourself in this stressful situation again by starting a more reliable method of contraception. Best wishes.
Dr. Diane Minich
Family Medicine 37 years experience
It is 80-97 %: Effective but should not be relied on for abirth control. Get on a more reliable form of birth control and use condo,s everytime. If you miss a period do a pregnancy test.

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Last updated Apr 24, 2016

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