Negative test turns positive?

I have been having a lot of pregnancy symptoms and I got what seemed to be a period this month. Well before the period I took 2 pregnancy tests and both were negative. But with the one I took the second time just hours after, the test was positive. Now I've been assuming I'm not simply because I know the box says don't look after the 3 minute mark, and this period, but I was reading online that this has happened to girls before and as it turns out they were actually pregnant. I'm not looking to hear how "that's impossible" or "you're stupid", just whether this has happened to you before or not. If yes I'd love to hear your story! 

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