Faint line? Help!

I took a test 2 days ago with FMU, and it was a BFN. Took another this morning with FMU, and think there's a very faint line?? Not sure if it's just me seeing what I want or if there really is a faint one there. Taken with a Wondfo strip 3-4 days before AF is due. Ovulation date 2 weeks ago.