Faint line - digital negative ... SO CONFUSED


Hey ladies.. I took 2 first response pregnancy tests yesterday and both came up with a VERY faint line almost immediately. This morning, I took a digital one and it came up negative. I don’t start my period for another 4 days. I’m just so confused why 2 would have a faint line then I’d get a negative. The reason I took the test in the first place is because I’ve been so nauseous for about a week now. Did I get 2 bad tests? Please help. Im so confused!!!!