How long after a vfl would you see a positive digital?

My husband ran to the store and grabbed a test for me this morning because all I have at home are digitals. Well, bless his heart he bought me more digitals. 2 negative digital tests this morning and yesterday morning. But AF is 4 days late with no signs of her coming anytime soon.

Just wondering if the digitals just can’t pick it up or if I’m getting my hopes up that I’ll even see a faint line.