Anyone have high first betas?

Jenny • Late 20's. TTC #1 Recovering from 2nd miscarriage at 6-7 weeks.
Just curious. Had first betas done this week and they were on the high side - beta #1 @ 500 (15dpo), beta #2 @ 952 (17dpo). 
I know the dates are right since I had an IUI with a trigger shot. Either it's a strong strong singleton that implanted early or maybe twins? I know betas are no guarantee of that. 

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