For sure negative???

Kaitlyn • Surprise! Baby number three on the way! Twin sisters who are about to both become big sisters!
​Does anyone see anything at all? Even if it's very faint? When in the natural light I convince myself I barely see something. But nothing if I'm indoors. AF is due 3/21 and I've had preg symptoms for several days, so confused. Any advice? 
​Test again at 14DPO? Or wait later? Or just stop testing all together? 
​The pic I posted doesn't quite show what you'd see in person...  
​Thanks ladies!