Should I see my doctor?

Sam
I took a hpt and got a BFN. But I still have so many symptoms! My breasts ache, I'm bloated, 2 weeks late, I'm nauseous, dizzy, and I'm cramping in my lower abdomen. I'm also exhausted all the time! 
Are hpt negatives ever wrong? Or is this all in my head?
Thank you in advance!