Blood HCG test?

Hey y'all! I'm in my TWW and I leave for a Vegas trip next Thursday (I'll only be 9 dpo). I  feel like I can't drink in my tww but I don't want to not drink if I'm not pregnant. Do y'all know if a blood test can tell me if I'm pregnant at 8 dpo? How long does it take blood tests to come back? 

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