confused clear blue digital vs first response

Kimberley

so I took a first response test on Nov 27 and got a vvfl so I was told to take a digital the next day. so on the 28th I took a clear blue digital and it came back negative. I was then told that it takes longer for the hcg to show on the digitals. is this true could the first response be telling me earlier ? picture of the first response

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