Missed period but no BFP?


I’m officially two days late, and I’m never late. This app is always right on the money.. I’m approx 12 DPO, but pregnancy tests are negative. I tested this AM as soon as I got up. There’s not even a faint line! Has anyone experienced this??? I’m so frustrated! Hubs and I have been trying for a while, already suffered one loss. :-/