No form of birth control is 100% effective. Any time there is penile insertion there is the risk of pregnancy.
If you don't want to be pregnant, then you should not be engaging in sexual intercourse. Its really that simple. The time to worry about getting pregnant is BEFORE you open your legs, not after.Hopefully this is only a scare, but one that will teach you both a lesson.
As jenn says, its only a day, we have no idea how regular you are. You need to wait until you are about 2 weeks late. And, stressing about can cause your period to delay.
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