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Confused BFN & BFP same day

Hi all, I took two pregnancy tests this morning with FMU (pregnosis early detection, and Clear Blue Digital) they were both definitely negative. However, this afternoon I took First Response and it's positive.

I'm so confused - how can I go from negative to positive in less than a day? The tests were the same sensitivity, and the two negatives were with FMU.

My question is - are First Response known for false positives?

Thanks in advance.