Help me

On Tuesday my period will be two weeks late. I know that I'm not going to get one this month, I just have that feeling. All of my test so far have been like this one. I can't see any second line so a BFN. I'm thinking about going to the doctors on Wednesday to have them do some blood work. Maybe I'm one of those people that won't get a BFP, this is me being hopeful. What do you guys think? When should I go to the doctor to see what's going on?