Cramping 6-7 DPO... BFP soon after?

Corrine
Do any of you expecting moms remember having any cramping around 6-7 DPO and get a BFP soon after? 
I've had noticeable cramps since 2DPO. They got heavier last night 6DPO and could feel them all night I am currently 7 DPO and have been cramping all morning with slight back pain.  

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