Could it be true?

Ok so I'm a month late for my period and the last time I took a pregnancy test was about 2weeks ago and they all said negative so I left it. I'm finding it abit strange that it still hasn't started so I'm going to the doctors tomorrow but... Just out of curiosity I did the bleach test and it fizzed up and had a lot of froff. I've heard that could mean I am? Has anyone done this and actually was pregnant or do you think it's a myth? 

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