Hcg 8/5 & 8/6

My hcg was 435 on 8/5 @ 2:30 pm. On 8/6 @ 11:30 am, it was 595. Doing the math, that would mean its doubling every 52 hrs rather than 48 hrs. They did an ultrasound yesterday @ 4w3d and couldn't find a gestational sac. Should i be concerned about an ectopic?

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