How often is it you can get a positive and negative back to back

Samantha • Wife💍- Mom 💙 🌈👶🏻💙

For my first son I took pregnancy tests in the past I took one 5 days after I conceived which gave me an extremely faint positive but I got negatives after that until my missed period. Now I got 1 positive and 1 negative. I’m wondering how often is it to get negatives after positive results but still be pregnant. Thanks 😊

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