How accurate are clear and simple pregnancy tests?

I am 13 and I had sex on a Saturday night. On the Wednesday I bought a clear and simple pregnancy test from Semi-Chem and it came up negative, would this be too early to take the test? Does this mean it could be a false result? Any advice? Thank you in advance and please do not judge me as it was a bad mistake. Just need to know if I'm pregnant and I can take things from there.
Asked Jun 25, 2014
They are very accurate more than half the time can you answer mine?
Answered Jun 26, 2014

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