If they were properly taken, less than 1%. Properly taken means taking all 21 active pills as close to only 24 hours apart without missing any. If you missed a pill or pills, it it possible to become pregnant. Are you asking because you took all your pills but didn't have a period during the inactives, that can happen and you still probably are NOT pregnant.
- Loestrin 24 Fe Information for Consumers
- Loestrin 24 Fe Information for Healthcare Professionals (includes dosage details)
- Side Effects of Loestrin 24 Fe (detailed)
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Lo Loestrin Fe - can you get pregnant if you stop taking the pill and then started back taking them?
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