What does it mean when a pregnancy test turns negative after 5 min?

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My sister got a blood pregnancy test that came back negative but it was too early to tell. She has missed her period and took another pregnancy test today and it immediately turned positive and about 5 min later she looked at it again ans it was negative. Can she be pregnant? Was the blood pregnancy test too early to tell? She had sex 3 weeks ago is it still too early? Someone please let me know.


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When I took my pregnancy test they all stayed positive they never changed

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