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Warrenton, MO
A 25-year-old female asked:

I started taking my birth control on the first day of my period. i started february 10th. unprotected sex no pull out last night. chance of pregnancy?

1 doctor answer2 doctors weighed in
Dr. Jacquelyn Stone
Obstetrics and Gynecology 16 years experience
Very little: You do not need a back up method of birth control when starting pills on the first day of your cycle. Birth control pills are 99% effective with "perfect use" (never missing a pill and taking them the same time every day), but about 91% effective with "typical use" (using them the way people typically do - occasionally missing a pill, not always taking them at the same time each day, etc).
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Created for people with ongoing healthcare needs but benefits everyone.
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Created for people with ongoing healthcare needs but benefits everyone.
Last updated Feb 22, 2016

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