what are the chances of getting pregnant from precum while on birth control?

I get pregnant from pre-cum if I’m on the pill?
By Kendall @ Planned Parenthood | June 15, 2011, 9:04 p.m.
Category: Birth Control
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Is it likely to get pregnant from pre-cum on the pill if you have taken it correctly?
The pill is up to 99.7% effective at preventing pregnancy, when it’s
Contraceptive pills?

Birth Control: The Pill
Birth control pills are a type of contraception that is 99% effective at preventing pregnancy when taken consistently every day. The pill contains hormones that regulate menstruation, lower the risk of ovarian and uterine cancers, improve acne and treat endometriosis.
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