Negative test but late af

eileen
So I'm only 2 days late have alot of af symptoms ( also have endo) i went to the clinic did a free test and it was negatve.. Still no af.. Does that mean im out? I took a 88 cent cheapie yesterday and there was a vvfl... But then again maybe my eyes were playing tricks.. Has anyone had a negative test at doctor and get a bfp a few days later ?