Very very very slim. She can test in another 3-4 weeks if she wants, but I think it'll be negative.

You can get pregnant by anything from pre-cum to ejaculating near... Test...

Well since it was so soon after her period, i'd say her chances are slim. Now there still could be an itty-bitty chance; if you're both concerned, have her take a pregnancy test after a couple of weeks. Or if you have the patience, wait until the time her next period should come. If it's missed or late and she is not under stress, you probably would want to start worrying.

(but remember, major stress can make the girl miss her period!)

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Scaredbaka - edumacated