What % of glow users had neg preg test until AF due or later?

Nat • I`m 28, SO is 36. TTC first child
Hi there,
Have many people taken preg tests and they have been negative until quite late? I get all excited when I read the "test up to 5 days before" but want to know is it actually common for these to be positive or do a lot of you find that it was way closer/after AF??