Two weeks late, and still BFN

Amanda
Today makes day 17 of missed period, and I'm still getting negatives. I know the obvious answer is that I should go get tested at the doc, but I don't want to spend money just for them to also tell me no. I have every pregnancy symptom I could find on the internet, but is it because I am or because I want to be? 
I need this not to be so stressful.