Beta Levels after IVF

Should beta levels truly double every 48 hours? I have read online that they should double every 48 to 72 hours. Mine only went up about 60% 48 hours later. The nurse told me that it should absolutely be double in 48 hours. They are now having me come in for another beta 4 days later. I am also not feeling as much of the "pregnancy symptoms" as I did a few days ago. I had my transfer the third week of October. Does anyone have any advise/comments? Thanks.

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