Af was due on 7/25

Tiera
Af was due on 7/25 still hasn't shown up yet .. I took a test on 7/24 and got a BFN so idk in trying my best not to get my hopes up like I did last month but now it's all I think about hoping Af doesn't show up but if I were pregnant would I have gotten a positive when I tested on 7/24?