Brown discharge?

Sydney
I took plan b just about two weeks ago. My period was due yesterday and I'm just now having brown discharge today. I feel crampy in my lower region, like I normally would with my period but it's not red blood. It's just this brown creamy discharge. Anyone experience this after taking plan b? Is it normal? 
I've read that it's just a side effect of plan b and could be my period coming on. 
Thanks!

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