So confused. First time TTC. Please help

Chelsie • May 2015.
So on glow It said my period was supposed to start on the 2nd. When it didn't come I took a test on the 3rd and it was negative. Well here it is the 16th and I still haven't had a period. And my boobs are killing me. 
​I want to trust the test and just accept that I'm not pregnant but I'm having second thoughts. 

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