8w Gender Results SneakPeek

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Has anyone taken SneakPeek at 8 weeks and received correct results?

It states you can take it at 8 weeks. I just got my results for girl and I’m second guessing if it was too early! I wouldn’t think they’d let you take it at 8w if they didn’t have a way to test that early. So I’m assuming there’s some type of science behind it. I know boy results and can mean it was contaminated.