Convinced I'm pregnant

I'm on the pill but sometimes forget to take it, I started my break week 6 days ago but I'm yet to get my period. I've been on the pill 4 years and have always gotten it before the end of the second day; I'm totally convinced I could well be pregnant but my boyfriend thinks I could be stressing. I've taken a test and from what I could see its negative. What do people think?? 

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