random light bleeding periods?

Kayhlin
I'm usually pretty heavy and horribly cramped for the first 2-3 days then light the last 3-4. But randomly my period came and I was light bleeding. Arely any cramps for like 2 days random spotting or like a day and then it was gone? 
Anyone experienced this before?
Also, no I'm not on birth control. But I am 24 and married. Not trying for kids, condom only :P

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