Splintered - Even in unprotected intercourse the chance of pregnancy (according to my reproduction lectures in biology this semester) is only 85%. Now add in the fact that only a fraction of the millions of sperm that would usually be let loose in there could possibly have gained access, and that fact that she's already showing signs of a period, I'd say you have very little to worry about.
I've got to say though, it's good that you're worried about it. Too many people live by 'It'll never happen to me' and end up making terrible mistakes.
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