What could cause doubling HCG every 12hrs

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HCG every 12hrs" />

Top two tests were on 11DPO AM/PM. Bottom was 12DPO AM. My hcg looks to be doubling every 12hours and I am curious what the possibilities are with your experiences why that could be when it's to double every 24-48hours not 12. There's a Visibly large difference in test lines every 12hours.

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