So confused!?!

Courtney
So I am officially a week late, but all the pregnancy test are showing up negative. I have no idea why. I had a miscarriage in December so I am wondering if it can be because I want one so bad or can it be because something is actually wrong? Should I wait and retest or go see a doctor? All these questions, and no answers. I can really uaw some advice. Thanks in advance :)