A member asked:

I'm on bc. last period was on june 18. i bled july 4-7. took pregnancy test today (negative). next period due july 16. not sure what's going on. ?

A doctor has provided 1 answer

Call Dr. if worried: Maybe the July period will be normal. For women taking birth control pills (OCP's) properly and consistently, the chance of pregnancy is reported to be 0.3% per year, or 1 pregnancy in 333 women each year. A woman is protected all days of the month, regardless of breakthrough bleeding, regardless of ovulation. (The actual pregnancy rate in the "real world" is reported to be at least 3% on OCP's.)

Answered 7/17/2019

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