My time of year come after 20 days. Why?

My last period was 20 days ago and very soon another one has come and with cramps. They ussually come about every 28-32 days and ending about 7 days and are regular flow and no cramps. But i had one before this one and it come after 25 days and it was really light. Why are they coming earlier? Should i see a doctor? And I've be stressing because school is starting soon. But i wasn't stressing when my other period before this one come a couple days early. Help?
Answers:
no reason.. it's totally normal. period's dont' come EXACTLY on doesn`t matter what days each month. especially if you're still young :)


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