Nobody ever reads my posts but I'll give it another shot

I'm officially 30 days late!!!! I'm freaking out because I keep getting negative test after test. Went to the local health department and all they do is urine tests. Of course it came back negative too. I keep expecting to see blood every time I go to the potty but I have nothing. No symptoms of AF and very few pregnancy symptoms. Such as headaches, mood swings, that kind of thing. My last period was in March. What could possibly be going on? I'm usually regular.