difference between dark and lighter BFP line

Ashley
My lines were pretty dark this morning. Thinking I am only 4wks along since my last AF day was Sept.27th. We had a miscarriage last July at 4weeks and had pretty faint lines and the digital said not pregnant and one said pregnant.
Does a darker line mean more HCG in my body or is there any difference at all between faint and darker lines? 

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