Why does this happen

St

Second digital that tells me NO which crushes me because with my first pregnancy all were positive. Including the digital. I’ll post my prior test with my #1 so you guys can see what I mean. Here’s my recent tests with #2 at 12DPO

And here is my test with #1 @ 11DPO

What’s the difference. I’m not buying anymore tests. This digital is annoying. I’m stressing over nothing. I am pregnant.