Why do negative test still not comfort me?

I don't understand. I've had this stupid scare for almost three months. I've taken a billion urine tests, some at doctors and some not, and they are all negative. Why are they not bringing me comfort?

Normal people see a negative test and they are like hey I'm not pregnant cool. But why do I like try and convince myself they are wrong?

I also had a blood test two weeks ago (two and a half months post sex) and it had an HCG count of less than 1.

Why did that not completely obliterate the thought? Now I keep thinking these tummy gurgles in my belly are kicking or something. And I try and see if I have a

"bump" ???!!!! I even had Nexplanon inserted over a month ago because I thought that would chill me out. Why is this happening? I know I sound absolutely crazy