Just scheduled an appointment with my ob

Just made an appointment for Tuesday and I'm terrified that they will find something bad wrong with me. I'm 36 days late and every test I've taken says NEGATIVE. I have some symptoms of pregnancy but I'm not sure if I should consider them symptoms of that or just an unfortunate past few months for me. I get headaches frequently, I have to tinkle a lot, and it feels like my bladder is never empty. I'm always hungry and I'm sleepy during the day but can't sleep at night. I'm convinced that I'm out for this cycle but I'm still scared because I don't know what could be wrong with me. I'm usually regular. I've never been on bc. I'm not on any new meds. The only thing I take is my daily prenatals. There's been absolutely no changes in my life. My last period was March 28. I can't handle this not knowing but I'm just so scared.