Positive test? Now nothing?

Merissa

2 days ago I posted I wasnt sure about a faint line the (first picture). Yesterday was even more faint but I didnt use FMP. Well today I have no line (2nd picture). And I'm 13 DPO, and not a sign of my period. 3rd picture is the test dried from the past 2 days. Should I try a different test brand? Or chalk it up and just wait for my period? I'm kinda driving myself crazy...

(These are the Pregmate tests from amazon).