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In early pregnwncy it can actually take up to 72 hours to double, 48 is more typical but 72 is just fine as well. It does look darker and I can tell some of the darkness from 12dpo was just from being dry. My progression with them was great, but I had twins and was doubling every 27 hours or something like that. Fxed you get good news soon so you can enjoy your pregnancy!