Would a digital definitely show up positive if I’m 16 days late?

Kyra

I’m late for my period I have taken other test and thought I could see faint line

But then I took a first response and I couldn’t see much

So I decided to take a digital test that come up no, is there a slight chance I could still be pregnant or is it just all in my head🤔

Please help me I am loosing my mind and want to know if has happened to others