I'm pretty sure this is fairly common hun. HCG progressively develops in your system, so it will become stronger and stronger in your system as time goes by. 9DPT is still fairly early for a 3 day transfer, I honestly wouldn't worry too much about it for now.
Please don't spend your days stressing about this when it could just be too early.
I really wish you all the best and hope you get your BFP in the next couple of days....
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