am I possibly pregnant???

I'm 5 days late. And I'm never late I always keep track of my period I was supposed to start on Friday some times I'll start a day before or a day after but it hasn't came at all. I'm a little nervous about it. But I sorta hope that I am because I really want a child of my own who I can love unconditionally. But if you have any ideas please tell me... I took a pregnancy test and it came negative could it be a false negative? Or should I take another one???