Testing complication

I took a FRER test yesterday (12ish DPO) and it was BFN. Buuuuut I think I held the stick wrong.

I read the directions and it said to hold the stick with “the window facing away from your body” which I thought meant holding it upside-down, but upon reassessment of the directions, I think it means holding the stick on a downward angle.

My question is: could holding the stick upside down cause a false negative? I’m testing again tomorrow, I just don’t know what to expect 😞