Had she not had sex for a while before you, because if you were her first sex for a while, that can make her body delay.
Taking the Plan B pill can do it too. What most people don't realize is that the "morning-after pill" is nothing more than the same hormones used in birth control, just in very high doses. So, it's very possible for her period to get fucked all to hell because of it.
Not to rag on you, but hopefully from now on you'll use a condom like a responsible person, or live with the consequences.
Best of luck.
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