The second line, please help!

Josibells
I took a pregnancy test and it came out negative, just one line came out. I was so excited I told my bc and sent him a pic and everything. I put it away, and a week later came across it and took a good look at it and I totally see a SECOND line on it now! I'm freaking out!!! Has this ever happened to any of you? What does it mean? 

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