I used OSOMs my last cycle and they frustrated me to no end. They claim no evaps, but I had two evap tests. I know they say some women show faint lines because these tests are SO sensitive that they sometimes pick up the small amount of hCG that is always in our systems >5miu. But I had blank ones and then two very, VERY faint lines. AF showed right on time. I hope that's not the case for you and that it's the start of a BFP. If it's not way more noticeable tomorrow I would discard it, these tests progress pretty fast.
First pic is your test, the next two pics are of MY OSOM evaps.