My period is late

My period is five weeks late, I have taken several tests and all have been negative. I've tried many different brands, blue lines, pink lines , digital and all are negative! I keep looking for that faint line and see nothing. I have an appointment in two weeks to see what's going on. I am just so annoyed because I have every symptom of being pregnant but the tests are all negative. We have been TTC for over a year and I just want to know. I am driving myself crazy wanting to know.