Will birth control kill the baby?

Ok say you had sex and the guy came in you.
And a week later you statred taking birth control.
Can you still be pregnant or will it kill the baby because
It was so soon?

thats like suting the gate after the horse has bolted babe, to late

You can still be pregnant, it's not going to act like a morning after pill.

If you keep taking your birth control pills, the hormones in the pill will affect the baby.

Birth control isn't 100% effective...I'm sure you've heard that before...so yes you still can be pregnant. Taking EC (Emergency Contraception-morning after pill) within 72 hours of intercourse can prevent pregnancy, but also again, is not 100% effective. I've heard taking birth control during pregnancy can cause birth defects, that's why they tell you you shouldn't take it if you plan to become pregnant or are already pregnant.