Whats wrong with me? Period question

Anonymous
My period is late and being weird. My boyfriend and I dry humped and now my period hasn't come yet (im still a virgin) so it was supposed to come on the 31st of dec and its always on time! Its either early or on time, its never late. A few hours ago I spotted a little and now its just completely gone =/ what's wrong with me?
Whats wrong with me? Period question
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