No AF but BFN? ☹️

I know we're all tired of seeing the same posts over and over..but this is one of those so I apologize in advance lol 
My AF is due today, took a test with SMU & got a BFN. I'm wondering if I could still be preggo or if I'm most likely out? Has anybody gotten a BFN on their expected AF day and later turned out to be pregnant?