HELP! 14 days late, feel pregnant but negative tests?

Lolo • Happily Married & TTC Baby #1!
I am currently 14 days late. I have so many doesn't symptoms, and none of them are linked to how to feel when I'm about to get AF. I'm so confused? I took a test this morning and a BFN popped up. My question is, what's the latest you've ever gotten your BFP? And also how did you get it? HPT, blood work or ultrasound?