Why am I getting positive tests but negative digitalis?

I took a test this morning and it came back with a vvf positive on a pregmate test strip. I’m getting a darker positive on FRER and a light positive on the dollar tree tests but I’m getting a negative on the digital. I thought it needed the same HCG for the pregmate that it did for the digital?( I took a clear blue digital this morning) any advice I’m only 11 DPO

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