Possibility of Pregnancy?

I'm 12 days dpo & 5-6 days past AF due date. Last month I miscarried/chemical pregnancy. My friend said this could throw off my period. I've taken a couple test, the last test taken 2 days ago. All of them BFNs. Is there any possibility I could be pregnant?! There are zero usual period symptoms like sore boobs, cramps, etc. 
Has anyone been here before? 

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