Dissapearing lines ?

Paige • Mommy to a Princess 👑TTC #2 with hubby ✨
I bought a couple 89 cent test from Walmart. AF isn't due till the 10th but ovia told me to test today. I took the test and seen a line as soon as the test started and I was so excited ! But once the test finished it was gone and now it's a bfn. What does that mean? Am I too early ?