Late positive

la

Can someone explain this to me?

I took a test 3 days after my missed period. It was negative.

4 weeks later I took another test and it was positive (my next period would have started a week later after this). Went to the doctor and he said I was 7 weeks.

Why was the first test negative when I technically was already 2.5 weeks pregnant? I'm blaming it on the cheap dollar test, but is there a better possible answer?

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